Marital and extra-marital live births by districts, municipalities and place of residence

Table

MARITAL AND EXTRA-MARITAL LIVE BIRTHS BY DISTRICTS, MUNICIPALITIES AND PLACE OF RESIDENCE IN 2025

(Number)
Districts Municipalities	Total			Urban residence			Rural residence
Districts Municipalities	Total	Marital	Extra-marital	Total	Marital	Extra-marital	Total	Marital	Extra-marital
Total	50 241	19 394	30 847	37 182	15 214	21 968	13 059	4 180	8 879
Blagoevgrad	2 220	1 039	1 181	1 334	604	730	886	435	451
Bansko	72	41	31	68	..	..	4	..	..
Belitsa	80	28	52	23	8	15	57	20	37
Blagoevgrad	547	243	304	512	225	287	35	18	17
Gotse Delchev	228	139	89	127	73	54	101	66	35
Garmen	153	58	95	-	-	-	153	58	95
Kresna	24	12	12	15	..	..	9	..	..
Petrich	390	169	221	257	106	151	133	63	70
Razlog	161	82	79	92	42	50	69	40	29
Sandanski	202	81	121	153	64	89	49	17	32
Satovcha	93	71	22	-	-	-	93	71	22
Simitli	88	41	47	42	14	28	46	27	19
Strumyani	45	5	40	-	-	-	45	5	40
Hadzhidimovo	52	31	21	14	7	7	38	24	14
Yakoruda	85	38	47	31	17	14	54	21	33
Burgas	2 827	1 284	1 543	2 107	942	1 165	720	342	378
Aytos	186	100	86	135	73	62	51	27	24
Burgas	1 408	630	778	1 365	612	753	43	18	25
Kameno	62	20	42	25	10	15	37	10	27
Karnobat	171	65	106	123	55	68	48	10	38
Malko Tarnovo	18	4	14	8	..	..	10	..	..
Nesebar	181	78	103	127	61	66	54	17	37
Pomorie	184	92	92	123	59	64	61	33	28
Primorsko	46	17	29	30	11	19	16	6	10
Ruen	204	149	55	-	-	-	204	149	55
Sozopol	92	42	50	31	17	14	61	25	36
Sredets	119	22	97	70	17	53	49	5	44
Sungurlare	102	45	57	25	9	16	77	36	41
Tsarevo	54	20	34	45	..	..	9	..	..
Varna	3 461	1 417	2 044	2 892	1 228	1 664	569	189	380
Avren	70	18	52	-	-	-	70	18	52
Aksakovo	151	50	101	92	32	60	59	18	41
Beloslav	53	18	35	36	10	26	17	8	9
Byala	18	6	12	..	..	..	..	..	..
Varna	2 551	1 145	1 406	2 484	1 125	1 359	67	20	47
Vetrino	38	14	24	-	-	-	38	14	24
Valchi Dol	67	16	51	14	-	14	53	16	37
Devnya	63	15	48	..	..	..	..	..	..
Dolni Chiflik	150	48	102	41	11	30	109	37	72
Dalgopol	91	32	59	38	4	34	53	28	25
Provadia	151	36	115	76	18	58	75	18	57
Suvorovo	58	19	39	36	11	25	22	8	14
Veliko Tarnovo	1 303	390	913	903	296	607	400	94	306
Veliko Tarnovo	547	185	362	474	166	308	73	19	54
Gorna Oryahovitsa	203	58	145	154	45	109	49	13	36
Elena	48	15	33	21	8	13	27	7	20
Zlataritsa	27	..	..	19	..	..	8	..	..
Lyaskovets	44	16	28	23	11	12	21	5	16
Pavlikeni	103	25	78	58	14	44	45	11	34
Polski Trambesh	81	20	61	25	14	11	56	6	50
Svishtov	149	45	104	103	30	73	46	15	31
Strazhitsa	91	19	72	20	3	17	71	16	55
Suhindol	10	..	..	6	..	..	4	..	..
Vidin	439	96	343	265	62	203	174	34	140
Belogradchik	32	4	28	29	..	..	3	..	..
Boynitsa	5	..	..	..	..	..	5	..	..
Bregovo	13	..	..	6	..	6	7	..	6
Vidin	240	67	173	200	57	143	40	10	30
Gramada	11	-	11	..	..	..	..	..	..
Dimovo	56	8	48	7	..	..	49	..	..
Kula	22	..	..	14	..	..	8	..	..
Makresh	5	..	..	-	-	-	5	..	..
Novo Selo	13	..	..	-	-	-	13	..	..
Ruzhintsi	28	3	25	-	-	-	28	3	25
Chuprene	14	6	8	-	-	-	14	6	8
Vratsa	1 139	259	880	586	167	419	553	92	461
Borovan	48	5	43	-	-	-	48	5	43
Byala Slatina	167	33	134	65	15	50	102	18	84
Vratsa	407	116	291	309	103	206	98	13	85
Kozloduy	142	37	105	70	24	46	72	13	59
Krivodol	82	10	72	27	3	24	55	7	48
Mezdra	138	32	106	58	11	47	80	21	59
Mizia	52	..	..	..	..	..	37	..	..
Oryahovo	54	10	44	28	6	22	26	4	22
Roman	33	6	27	14	3	11	19	3	16
Hayredin	16	..	..	..	..	..	16	..	..
Gabrovo	558	163	395	448	127	321	110	36	74
Gabrovo	276	74	202	250	68	182	26	6	20
Dryanovo	33	5	28	..	..	..	..	..	..
Sevlievo	204	71	133	125	43	82	79	28	51
Tryavna	45	13	32	..	..	..	..	..	..
Dobrich	913	302	611	596	221	375	317	81	236
Balchik	118	40	78	68	27	41	50	13	37
General Toshevo	77	23	54	36	16	20	41	7	34
Dobrich-selska	123	27	96	-	-	-	123	27	96
Dobrich	386	149	237	386	149	237	-	-	-
Kavarna	80	19	61	69	17	52	11	..	..
Krushari	34	..	..	-	-	-	34	..	..
Tervel	76	40	36	23	10	13	53	30	23
Shabla	19	..	..	14	..	..	5	..	..
Kardzhali	754	468	286	396	247	149	358	221	137
Ardino	25	21	4	14	..	..	11	..	..
Dzhebel	27	21	6	14	..	..	13	..	..
Kirkovo	78	51	27	-	-	-	78	51	27
Krumovgrad	104	40	64	20	13	7	84	27	57
Kardzhali	419	254	165	309	182	127	110	72	38
Momchilgrad	67	50	17	39	30	9	28	20	8
Chernoochene	34	31	3	-	-	-	34	31	3
Kyustendil	677	202	475	534	159	375	143	43	100
Bobovdol	39	11	28	31	8	23	8	3	5
Boboshevo	..	..	..	8	..	..	5	..	..
Dupnitsa	253	72	181	204	58	146	49	14	35
Kocherinovo	22	6	16	11	5	6	11	..	..
Kyustendil	299	95	204	244	78	166	55	17	38
Nevestino	..	..	..	-	-	-	..	..	..
Rila	17	3	14	14	..	..	3	..	..
Sapareva Banya	31	12	19	22	7	15	9	5	4
Treklyano	..	..	..	..	..	..	..	..	..
Lovech	871	192	679	532	122	410	339	70	269
Apriltsi	15	5	10	15	5	10	-	-	-
Letnitsa	29	9	20	..	..	..	..	..	..
Lovech	184	47	137	144	37	107	40	10	30
Lukovit	208	37	171	106	21	85	102	16	86
Teteven	124	33	91	49	10	39	75	23	52
Troyan	163	50	113	113	37	76	50	13	37
Ugarchin	61	3	58	..	..	..	..	..	..
Yablanitsa	87	8	79	40	3	37	47	5	42
Montana	829	229	600	489	169	320	340	60	280
Berkovitsa	109	46	63	94	39	55	15	7	8
Boychinovtsi	80	12	68	10	4	6	70	8	62
Brusartsi	30	6	24	4	-	4	26	6	20
Valchedram	75	15	60	20	4	16	55	11	44
Varshets	69	15	54	65	..	..	4	..	..
Georgi Damyanovo	..	..	..	-	..	..	..	..	..
Lom	113	36	77	86	33	53	27	3	24
Medkovets	26	5	21	-	-	-	26	5	21
Montana	271	86	185	205	75	130	66	11	55
Chiprovtsi	..	..	..	5	..	..	..	..	..
Yakimovo	45	5	40	-	-	-	45	5	40
Pazardzhik	1 758	559	1 199	1 050	346	704	708	213	495
Batak	29	20	9	14	..	..	15	..	..
Belovo	27	5	22	14	..	..	13	..	..
Bratsigovo	56	12	44	26	7	19	30	5	25
Velingrad	319	82	237	198	37	161	121	45	76
Lesichovo	43	11	32	-	-	-	43	11	32
Pazardzhik	641	226	415	354	139	215	287	87	200
Panagyurishte	137	53	84	92	41	51	45	12	33
Peshtera	106	35	71	98	..	..	8	..	..
Rakitovo	142	43	99	124	37	87	18	6	12
Septemvri	180	46	134	76	20	56	104	26	78
Strelcha	35	10	25	29	10	19	6	-	6
Sarnitsa	43	16	27	25	13	12	18	3	15
Pernik	724	241	483	634	218	416	90	23	67
Breznik	26	..	..	18	..	..	8	..	..
Zemen	15	-	15	10	-	10	5	-	5
Kovachevtsi	7	..	..	-	..	..	7	..	..
Pernik	544	198	346	491	180	311	53	18	35
Radomir	112	32	80	98	..	..	14	..	..
Tran	20	3	17	17	3	14	3	-	3
Pleven	1 620	439	1 181	984	318	666	636	121	515
Belene	24	8	16	20	8	12	4	-	4
Gulyantsi	64	11	53	29	7	22	35	4	31
Dolna Mitropolia	154	34	120	71	17	54	83	17	66
Dolni Dabnik	99	21	78	37	10	27	62	11	51
Iskar	43	10	33	19	4	15	24	6	18
Knezha	96	26	70	78	..	..	18	..	..
Levski	101	28	73	45	14	31	56	14	42
Nikopol	26	5	21	11	..	..	15	..	..
Pleven	803	240	563	559	195	364	244	45	199
Pordim	40	8	32	23	5	18	17	3	14
Cherven Bryag	170	48	122	92	28	64	78	20	58
Plovdiv	5 392	2 231	3 161	4 007	1 766	2 241	1 385	465	920
Asenovgrad	422	199	223	350	174	176	72	25	47
Brezovo	59	21	38	22	7	15	37	14	23
Kaloyanovo	75	29	46	-	-	-	75	29	46
Karlovo	368	74	294	136	35	101	232	39	193
Krichim	66	19	47	66	19	47	-	-	-
Kuklen	40	..	..	39	20	19	..	..	..
Laki	11	..	..	9	-	9	..	..	..
Maritsa	266	106	160	-	-	-	266	106	160
Perushtitsa	45	17	28	45	17	28	-	-	-
Plovdiv	2 864	1 298	1 566	2 864	1 298	1 566	-	-	-
Parvomay	142	51	91	74	29	45	68	22	46
Rakovski	268	124	144	146	75	71	122	49	73
Rodopi	234	102	132	-	-	-	234	102	132
Sadovo	171	49	122	32	10	22	139	39	100
Sopot	65	26	39	61	22	39	4	4	-
Stamboliyski	168	53	115	80	29	51	88	24	64
Saedinenie	80	25	55	58	18	40	22	7	15
Hisarya	48	16	32	25	13	12	23	3	20
Razgrad	626	339	287	268	133	135	358	206	152
Zavet	60	35	25	24	11	13	36	24	12
Isperih	121	71	50	43	22	21	78	49	29
Kubrat	83	45	38	29	14	15	54	31	23
Loznitsa	52	23	29	4	..	..	48	..	..
Razgrad	244	121	123	151	71	80	93	50	43
Samuil	41	23	18	-	-	-	41	23	18
Tsar Kaloyan	25	21	4	17	..	..	8	..	..
Ruse	1 097	435	662	857	353	504	240	82	158
Borovo	20	7	13	8	..	..	12	..	..
Byala	74	17	57	38	11	27	36	6	30
Vetovo	67	27	40	58	..	..	9	..	..
Dve Mogili	42	17	25	20	11	9	22	6	16
Ivanovo	34	15	19	-	-	-	34	15	19
Ruse	788	326	462	714	297	417	74	29	45
Slivo Pole	49	22	27	19	11	8	30	11	19
Tsenovo	23	4	19	-	-	-	23	4	19
Silistra	632	281	351	242	113	129	390	168	222
Alfatar	10	-	10	4	-	4	6	-	6
Glavinitsa	72	31	41	10	7	3	62	24	38
Dulovo	180	101	79	50	23	27	130	78	52
Kaynardzha	48	7	41	-	-	-	48	7	41
Silistra	218	89	129	132	61	71	86	28	58
Sitovo	34	19	15	-	-	-	34	19	15
Tutrakan	70	34	36	46	22	24	24	12	12
Sliven	2 009	470	1 539	1 128	340	788	881	130	751
Kotel	195	50	145	45	20	25	150	30	120
Nova Zagora	304	73	231	147	45	102	157	28	129
Sliven	1 276	328	948	764	259	505	512	69	443
Tvarditsa	234	19	215	172	16	156	62	3	59
Smolyan	410	115	295	270	72	198	140	43	97
Banite	5	..	..	-	-	-	5	..	..
Borino	12	6	6	-	-	-	12	6	6
Devin	41	13	28	32	9	23	9	4	5
Dospat	30	15	15	8	5	3	22	10	12
Zlatograd	37	10	27	20	4	16	17	6	11
Madan	44	8	36	24	5	19	20	3	17
Nedelino	8	..	..	4	..	..	4	..	..
Rudozem	30	6	24	10	3	7	20	3	17
Smolyan	176	49	127	149	42	107	27	7	20
Chepelare	27	4	23	23	4	19	4	-	4
Sofia (stolitsa)	11 562	5 454	6 108	11 122	5 275	5 847	440	179	261
Stolichna	11 562	5 454	6 108	11 122	5 275	5 847	440	179	261
Sofia	1 843	599	1 244	1 168	379	789	675	220	455
Anton	13	..	..	-	..	..	..	..	..
Bozhurishte	70	28	42	46	16	30	24	12	12
Botevgrad	293	90	203	188	64	124	105	26	79
Godech	35	8	27	33	..	..	..	..	..
Gorna Malina	55	18	37	-	-	-	55	18	37
Dolna Banya	59	20	39	59	20	39	-	-	-
Dragoman	26	5	21	21	..	..	5	..	..
Elin Pelin	174	77	97	52	20	32	122	57	65
Etropole	75	27	48	58	..	..	17	..	..
Zlatitsa	31	..	..	28	..	..	3	..	..
Ihtiman	204	50	154	175	44	131	29	6	23
Koprivshtitsa	15	3	12	15	3	12	-	-	-
Kostenets	59	29	30	29	13	16	30	16	14
Kostinbrod	140	54	86	94	38	56	46	16	30
Mirkovo	16	4	12	-	-	-	16	4	12
Pirdop	41	10	31	38	10	28	3	-	3
Pravets	87	19	68	26	9	17	61	10	51
Samokov	268	85	183	217	69	148	51	16	35
Svoge	105	37	68	44	16	28	61	21	40
Slivnitsa	49	18	31	45	..	..	4	..	..
Chavdar	8	..	..	..	..	..	8	..	..
Chelopech	20	6	14	-	-	-	20	6	14
Stara Zagora	2 389	698	1 691	1 628	552	1 076	761	146	615
Bratya Daskalovi	69	9	60	-	-	-	69	9	60
Gurkovo	60	8	52	33	5	28	27	3	24
Galabovo	78	18	60	53	9	44	25	9	16
Kazanlak	495	158	337	370	128	242	125	30	95
Maglizh	120	13	107	30	..	..	90	..	..
Nikolaevo	82	6	76	59	..	..	23	..	..
Opan	14	4	10	-	-	-	14	4	10
Pavel Banya	117	18	99	15	4	11	102	14	88
Radnevo	133	36	97	76	28	48	57	8	49
Stara Zagora	1 041	392	649	874	347	527	167	45	122
Chirpan	180	36	144	118	24	94	62	12	50
Targovishte	619	276	343	335	164	171	284	112	172
Antonovo	30	3	27	8	..	..	22	..	..
Omurtag	100	44	56	26	9	17	74	35	39
Opaka	32	27	5	12	..	..	20	..	..
Popovo	124	44	80	74	29	45	50	15	35
Targovishte	333	158	175	215	117	98	118	41	77
Haskovo	1 576	500	1 076	1 112	349	763	464	151	313
Dimitrovgrad	302	79	223	220	53	167	82	26	56
Ivaylovgrad	33	13	20	14	4	10	19	9	10
Lyubimets	93	13	80	66	8	58	27	5	22
Madzharovo	10	..	..	..	..	..	5	..	..
Mineralni Bani	33	18	15	-	-	-	33	18	15
Svilengrad	156	42	114	122	34	88	34	8	26
Simeonovgrad	117	6	111	98	..	..	19	..	..
Stambolovo	34	..	..	..	..	..	34	..	..
Topolovgrad	54	13	41	17	5	12	37	8	29
Harmanli	174	43	131	134	34	100	40	9	31
Haskovo	570	255	315	436	205	231	134	50	84
Shumen	1 008	449	559	614	285	329	394	164	230
Veliki Preslav	38	15	23	21	..	..	17	..	..
Venets	37	21	16	-	-	-	37	21	16
Varbitsa	58	27	31	34	16	18	24	11	13
Kaolinovo	78	47	31	10	6	4	68	41	27
Kaspichan	56	11	45	25	6	19	31	5	26
Nikola Kozlevo	64	28	36	-	-	-	64	28	36
Novi Pazar	92	25	67	54	14	40	38	11	27
Smyadovo	32	6	26	23	..	..	9	..	..
Hitrino	33	16	17	-	-	-	33	16	17
Shumen	520	253	267	447	229	218	73	24	49
Yambol	985	267	718	681	207	474	304	60	244
Bolyarovo	26	4	22	9	..	..	17	..	..
Elhovo	90	30	60	54	..	..	36	..	..
Straldzha	151	20	131	96	11	85	55	9	46
Tundzha	196	40	156	-	-	-	196	40	156
Yambol	522	173	349	522	173	349	-	-	-
.. Data is confidential according to article 25 of the Law on Statistics

29.04.2026

Time series

Pop_1.2.2._birth_DR_EN.xlsx

Metadata

Methodology

Euro-SDMX Metadata Structure (ESMS)

FERTILITY - Births, Live births, Birth rates, Mean age of the mother at birth and Total fertility rate
Contact
Contact organisation	National Statistical Institute
Contact organisation unit	Population and Housing Fund Statistics Department
Contact name	Nadejda Karlezhova
Contact person function	State expert
Contact mail address	2, P. Volov Str.; 1038 Sofia, Bulgaria
Contact email address	[email protected]
Contact phone number	+359 2 9857 543
Contact fax number
Metadata update
Metadata last certified	29 April 2026
Metadata last posted	29 April 2026
Metadata last update	29 April 2026
Statistical presentation
Data description	The births and the children born are surveyed. Registration is done at the moment of occurrence and the number is calculated as of 31.12 of the reference year. Live births and stillbirths are covered. Source of data on births and children born is the Unified System for Civil registration and Administrative Service of Population. Births are registered through a common USCRASP-CDS document "Birth notification". Regional breakdown of the fertility data is done according to the country administrative-territorial division as of 31.12 of the reference year (settlements, municipalities, districts and statistical regions) based on the current address. Live births are used for calculation of indicators, characterizing the fertility.
Classification system	· Classification of Territorial Units for Statistical Purposes in Bulgaria (NUTS); · Unified Classification of the Administrative-Territorial and Territorial Units in Bulgaria (UCATTU).
Sector coverage	All children born with a usual residence (current address) in the Republic of Bulgaria are included.
Statistical concepts and definitions	‘Birth’ is a complete expulsion or extraction from the mother of a foetus, irrespective alive or dead, that meet the following criteria: a) 25 weeks of gestation and/or 700 grams and over; b) less than 25 weeks of gestation - provided that the foetus has lived at least 72 hours (3 days). "Alive" is a foetus who shows signs of blood circulation. In absence of such signs, the foetus is considered “dead” (foetus mortuus). “Abortion” is a loss or interruption of a pregnancy before the foetus to meet the above mentioned criteria. Crude birth rate is the ratio of the number of live births during the year to the average annual population in that year. The value is expressed per 1000 inhabitants. The total fertility rate is the sum of the age-specific fertility rates for the reference year. It represents the mean number of children that would be born alive to a woman during her lifetime if she were to pass through her childbearing years conforming to the fertility rates by age of a given year. The net reproduction rate is the ratio between the number of women who have gave a birth during the year and the daughters born during the same year taking into account the mortality. It represents the average number of daughters that will survive until childbearing ages, born to a woman if they will experience the age-specific fertility and mortality rates of the year in question, i.e. how many girls replace a mother under the reproduction conditions during the respective year. The age of parents at birth is calculated in completed years based on the date of birth of parents and the date of event birth. The mean age of the mother at childbearing is calculated as a weighted average within the interval between the birth of mothers generations and children birth.
Statistical unit	Children born - live born and stillborn.
Statistical population	Total number of births.
Reference area	Regional breakdown of the fertility data is done according to the country administrative-territorial division as of 31.12 of the reference year (settlements, municipalities, districts and statistical regions).
Time coverage	1888 - 2025 total number and by sex; 2010 - 2025 on the NSI website.
Base period	Not applicable.
Unit of measure
Number; per 1 000 population; per 100 population, years.
Reference period
Calendar year
Institutional mandate
Legal acts and other agreements	· Law on Statistics; · Law on Civil Registration; · Ordinance of the Ministry of Health. · Regulation (EU) 2458/2025 of the European Parliament and of the Council on on European statistics on population and housing, amending Regulation (EC) No 862/2007 and repealing Regulations (EC) No 763/2008 and (EU) No 1260/2013; · Commission implementing regulation (EU) № 205/2014 laying down uniformed conditions for the implementation of Regulation (EU) No 1260/2013 of the European Parliament and the Council on European demographic statistics, as regards breakdowns of data, deadlines and data revisions;
Data sharing	Data are transmitted to Eurostat, UNICEF, UN ECE, World bank and other institutions on the basis of Regulation (EU) 1260/2013 of the European Parliament and of the Council on the European demographic statistics.
Confidentiality
Confidentiality - policy	· Law on Statistics; · Regulation (EC) No 223/2009 on European statistics (recital 24 and Article 20(4)) of 11 March 2009 (OJ L 87, p. 164), stipulates the need to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with due account for technical developments and the requirements of users in a democratic society.
Confidentiality - data treatment	Individual data are not published in accordance with article 25 of the Law on Statistics. The publishing of individual data can be performed only in accordance with article 26 of the same law.
Release policy
Release calendar	Information is published annually according to the Release Calendar presenting the results of the statistical surveys carried out by the National Statistical Institute.
Release calendar access	The calendar is available on the NSI website: http://www.nsi.bg/en/node/480
User access	Data is published on the NSI website, section Population - Demography, migration and projections in accordance with the Law on Statistics and the European Statistics Code of Practice respecting the professional independence and aimed at objectivity, transparency and equal treatment of all consumers.
Frequency of dissemination
Annually
Accessibility and clarity
News release	News release "Population and demographic processes".
Publications	· Population and demographic processes; · Statistical Reference book; · Statistical Yearbook; · Booklet "Bulgaria".
On-line database	Data on Fertility are available to all users of the NSI website under the heading Population - Demography, Migration and Projections - Fertility: http://www.nsi.bg/en/node/6610 Information System Infostat: https://infostat.nsi.bg/infostat/pages/module.jsf?x_2=52
Micro-data access	Anonymised individual data can be provide for scientific and research purposes, and for individual request according to the Rules for the provision of anonymised individual data for scientific and research purposes.
Other	Information service on request, according to the Rules for the dissemination of statistical products and services in NSI.
Documentation on methodology	· Methodology on fertility: http://www.nsi.bg/sites/default/files/files/metadata/Pop_1_Metodology_births_en.pdf; · Manual for functioning of the Unified System for Civil registration and Administrative Service of Population.
Quality documentation	Not available.
Quality management
Quality assurance	Not applicable.
Quality assessment	Not applicable.
Relevance
User needs	Data on fertility are presented annually to the Eurostat, UN, UNICEF, ECE, WHO and others ? questionnaires filled in annually. At national and regional level the main data users are ministries, agencies, national organisations and local authorities. Data is presented to scientific institutes, universities, NGOs and others based on requests.
User satisfaction	No user' satisfaction surveys are carried out.
Completeness	Data on fertility is available by sex, weight, height, consecutive number and residence of the child (different territorial levels), place and assistance at birth, multi-foetal births, age (different groupings) of the parents, year of birth of the parents, consecutive number of the mother marriage, pregnancy, citizenship and country of birth of the mother, citizenship of the father.
Accuracy and reliability
Overall accuracy	Not applicable.
Sampling error	Not applicable.
Non-sampling error	Not applicable.
Timeliness and punctuality
Timeliness	Data is published up to the end of April of the year following the reference year.
Punctuality	Data is released according to the terms provided in the Release Calendar presenting the results of the statistical surveys carried out by the National Statistical Institute..
Coherence and comparability

Comparability - geographical	Data is collected and processed for the different territorial units using one and the same methodology and definitions.
Comparability - over time	Changes of the methodology and definitions for different time periods are published in the survey methodology and metadata. Due to the availability of a new population estimation based on Census 2021 data, there is a break in the time series for all 2022 rates, calculated with the average annual population.
Coherence - cross domain	Not applicable.
Coherence - internal	Not applicable.
Cost and burden
Not applicable.
Data revision
Data revision - policy	Not applicable.
Data revision - practice	Not applicable.
Statistical processing
Source data	Source of data on births and children born is the Unified System for Civil registration and Administrative Service of Population. Births are registered through a common USCRASP-CDS ?Birth notification?.
Frequency of data collection	Monthly
Data collection	Exhaustively for all births registered during the year. Computer files are received from the Unified System for Civil registration and Administrative Service of Population (administrative source).
Data validation	Data on demographic events is checked and controlled before to be loaded in the IS "Demography". For successful processing, the initial notification should meet the system rules on validation and control. The processed results are validated in respect the consistency of a single table and between the tables.
Data compilation	Data is processed by the IS "Demography" according to the rules for validation and control of the demographic events.
Adjustment	Not applicable.
Comment

Download in SDMX 2.1 file format: FERTILITY - Births, Live births, Birth rates, Mean age of the mother at birth and Total fertility rate

Metadata Structure Definition in SDMX 2.1: ESMS_MSD+BNSI+2.0+SDMX.2.1.xml

Download in SDMX 2.0 file format: FERTILITY - Births, Live births, Birth rates, Mean age of the mother at birth and Total fertility rate

Metadata Structure Definition in SDMX 2.0: ESMS_MSD+BNSI+2.0+SDMX.2.0.xml

Quality reports

ESS Standard for Quality Reports Structure (ESQRS)

FERTILITY - Births, Live births, Birth rates, Mean age of the mother at birth and Total fertility rate
Contact
Contact organisation	National Statistical Institute
Contact organisation unit	Population and Housing Fund Statistics Department
Contact name	Nadejda Karlezhova
Contact person function	State expert
Contact mail address	2, P. Volov Str.; 1038 Sofia, Bulgaria
Contact email address	[email protected]
Contact phone number	+359 2 9857 543
Contact fax number
Statistical presentation
Data description	The births and the children born are surveyed. Registration is done at the moment of occurrence and the number is calculated as of 31.12 of the reference year. Live births and stillbirths are covered. Source of data on births and children born is the Unified System for Civil registration and Administrative Service of Population. Births are registered through a common USCRASP-CDS document "Birth notification". Regional breakdown of the fertility data is done according to the country administrative-territorial division as of 31.12 of the reference year (settlements, municipalities, districts and statistical regions) based on the current address. Live births are used for calculation of indicators, characterizing the fertility.
Classification system	· Classification of Territorial Units for Statistical Purposes in Bulgaria (NUTS); · Unified Classification of the Administrative-Territorial and Territorial Units in Bulgaria (UCATTU).
Sector coverage	All children born with a usual residence (current address) in the Republic of Bulgaria are included.
Statistical concepts and definitions	‘Birth’ is a complete expulsion or extraction from the mother of a foetus, irrespective alive or dead, that meet the following criteria: a) 25 weeks of gestation and/or 700 grams and over; b) less than 25 weeks of gestation - provided that the foetus has lived at least 72 hours (3 days). "Alive" is a foetus who shows signs of blood circulation. In absence of such signs, the foetus is considered “dead” (foetus mortuus). “Abortion” is a loss or interruption of a pregnancy before the foetus to meet the above mentioned criteria. Crude birth rate is the ratio of the number of live births during the year to the average annual population in that year. The value is expressed per 1000 inhabitants. The total fertility rate is the sum of the age-specific fertility rates for the reference year. It represents the mean number of children that would be born alive to a woman during her lifetime if she were to pass through her childbearing years conforming to the fertility rates by age of a given year. The net reproduction rate is the ratio between the number of women who have gave a birth during the year and the daughters born during the same year taking into account the mortality. It represents the average number of daughters that will survive until childbearing ages, born to a woman if they will experience the age-specific fertility and mortality rates of the year in question, i.e. how many girls replace a mother under the reproduction conditions during the respective year. The age of parents at birth is calculated in completed years based on the date of birth of parents and the date of event birth. The mean age of the mother at childbearing is calculated as a weighted average within the interval between the birth of mothers generations and children birth.
Statistical unit	Children born - live born and stillborn.
Statistical population	Total number of births.
Reference area	Regional breakdown of the fertility data is done according to the country administrative-territorial division as of 31.12 of the reference year (settlements, municipalities, districts and statistical regions).
Time coverage	1888 - 2025 total number and by sex; 2010 - 2025 on the NSI website.
Base period	Not applicable.
Statistical processing
Source data	Source of data on births and children born is the Unified System for Civil registration and Administrative Service of Population. Births are registered through a common USCRASP-CDS ?Birth notification?.
Frequency of data collection	Monthly
Data collection	Exhaustively for all births registered during the year. Computer files are received from the Unified System for Civil registration and Administrative Service of Population (administrative source).
Data validation	Data on demographic events is checked and controlled before to be loaded in the IS "Demography". For successful processing, the initial notification should meet the system rules on validation and control. The processed results are validated in respect the consistency of a single table and between the tables.
Data compilation	Data is processed by the IS "Demography" according to the rules for validation and control of the demographic events.
Adjustment	Not applicable.
Quality management
Quality assurance	Not applicable.
Quality assessment	Not applicable.
Relevance
User needs	Data on fertility are presented annually to the Eurostat, UN, UNICEF, ECE, WHO and others ? questionnaires filled in annually. At national and regional level the main data users are ministries, agencies, national organisations and local authorities. Data is presented to scientific institutes, universities, NGOs and others based on requests.
User satisfaction	No user' satisfaction surveys are carried out.
Completeness	Data on fertility is available by sex, weight, height, consecutive number and residence of the child (different territorial levels), place and assistance at birth, multi-foetal births, age (different groupings) of the parents, year of birth of the parents, consecutive number of the mother marriage, pregnancy, citizenship and country of birth of the mother, citizenship of the father.
Data completeness - rate	100%
Accuracy and reliability
Overall accuracy	Not applicable.
Sampling error	Not applicable.
Sampling errors - indicators	Not applicable.
Non-sampling error	Not applicable.
Coverage error	Not applicable.
Over-coverage - rate	Not applicable
Common units - proportion	Not applicable
Measurement error	Not applicable
Non response error	Not applicable
Unit non-response - rate	Not applicable
Item non-response - rate	Not applicable
Processing error	Not applicable
Imputation - rate	Not applicable
Model assumption error	Not applicable
Seasonal adjustment	Not applicable
Data revision - policy	Not applicable.
Data revision - practice	Not applicable.
Data revision - average size
Timeliness and punctuality
Timeliness	Data is published up to the end of April of the year following the reference year.
Time lag - first results	4 months after the reference year.
Time lag - final results	4 months after the reference year.
Punctuality	Data is released according to the terms provided in the Release Calendar presenting the results of the statistical surveys carried out by the National Statistical Institute..
Punctuality - delivery and publication	Nor applicable
Coherence and comparability

Comparability - geographical	Data is collected and processed for the different territorial units using one and the same methodology and definitions.
Asymmetry for mirror flows statistics - coefficient	Not applicable
Comparability - over time	Changes of the methodology and definitions for different time periods are published in the survey methodology and metadata. Due to the availability of a new population estimation based on Census 2021 data, there is a break in the time series for all 2022 rates, calculated with the average annual population.
Length of comparable time series	2000 onwards
Coherence - cross domain	Not applicable.
Coherence - sub annual and annual statistics	Not applicable
Coherence - National Accounts	Not applicable
Coherence - internal	Not applicable.
Accessibility and clarity
News release	News release "Population and demographic processes".
Publications	· Population and demographic processes; · Statistical Reference book; · Statistical Yearbook; · Booklet "Bulgaria".
On-line database	Data on Fertility are available to all users of the NSI website under the heading Population - Demography, Migration and Projections - Fertility: http://www.nsi.bg/en/node/6610 Information System Infostat: https://infostat.nsi.bg/infostat/pages/module.jsf?x_2=52
Data tables - consultations	not applicable
Micro-data access	Anonymised individual data can be provide for scientific and research purposes, and for individual request according to the Rules for the provision of anonymised individual data for scientific and research purposes.
Other	Information service on request, according to the Rules for the dissemination of statistical products and services in NSI.
Metadata - consultations	not applicable
Documentation on methodology	· Methodology on fertility: http://www.nsi.bg/sites/default/files/files/metadata/Pop_1_Metodology_births_en.pdf; · Manual for functioning of the Unified System for Civil registration and Administrative Service of Population.
Metadata completeness – rate	100%
Quality documentation	Not available.
Cost and burden
Not applicable.
Confidentiality
Confidentiality - policy	· Law on Statistics; · Regulation (EC) No 223/2009 on European statistics (recital 24 and Article 20(4)) of 11 March 2009 (OJ L 87, p. 164), stipulates the need to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and the access to those confidential data with due account for technical developments and the requirements of users in a democratic society.
Confidentiality – data treatment	Individual data are not published in accordance with article 25 of the Law on Statistics. The publishing of individual data can be performed only in accordance with article 26 of the same law.
Comment

Download in SDMX 2.1 file format: FERTILITY - Births, Live births, Birth rates, Mean age of the mother at birth and Total fertility rate

Metadata Structure Definition in SDMX 2.1: ESQRS_MSD+BNSI+2.0+SDMX.2.1.xml

Download in SDMX 2.0 file format: FERTILITY - Births, Live births, Birth rates, Mean age of the mother at birth and Total fertility rate

Metadata Structure Definition in SDMX 2.0: ESQRS_MSD+BNSI+2.0+SDMX.2.0.xml

Press releases

Date	Name	File
29.04.2026	Population and Demographic processes - 2025 - final data	720.3 kb
22.05.2025	Mortality and Life expectancy - 2022 - 2024	738.1 kb
29.04.2025	Population and Demographic processes - 2024 - final data	646.4 kb
26.07.2024	Post census revision of the population data for the period 2012 – 2021	220.84 kb
22.05.2024	Life Expectancy at Birth in the Period 2021 - 2023	456.11 kb
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Date	Name
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Date	Name	File
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