Most common birthdays in the U.S.: all 366 dates ranked

September 9 has the most recorded births in these historical U.S. records. Explore the ranking and see how it compares with the other leading dates.

85,712,738 U.S. births. 1994–2014 · CDC/NCHS + SSA. Sources & method

September 9 is the most common birthday.

259,228 of the 85,712,738 recorded U.S. births fell on September 9. That’s 0.302% of births in 1994–2014. This ranking uses total births across the full period.

September 9 leads by 1,247 births

September 19 is second with 257,981 recorded births. September 9 leads by 1,247 births, or 0.48% of September 19’s total. The calculation is 1,247 ÷ 257,981 × 100, rounded to 0.48%.

Five leading birthdays by total recorded births in U.S. records, 1994–2014. September 9: 259,228. September 19: 257,981. September 12: 257,913. September 17: 256,231. September 10: 255,991. The scale starts at zero. September 9 leads by 1,247 births, or 0.48% of September 19's total. Each date occurred 21 times. Annual winners differ in SSA records for 2000–2014. — Five leading dates by total recorded births. Each occurred 21 times. The scale starts at zero. U.S. records, 1994–2014. Source: CDC/NCHS 1994–1999 and SSA 2000–2014 via FiveThirtyEight.

Download the full-size leading-birthday comparison or read the pinned source data. The five-date table below gives the same counts and births per occurrence.

The annual winner can differ from the overall leader. September 9 led only in 2004 and 2009 within the separate SSA 2000–2014 series. Our year-by-year study uses that single source series. Its period differs from this combined 1994–2014 ranking.

Find your birthday in the full list

Why does September 9 lead the ranking?

01 September 9 0.302%
02 September 19 0.301%
03 September 12 0.301%
04 September 17 0.299%
05 September 10 0.299%
06 September 20 0.298%
07 July 7 0.298%
08 September 15 0.297%
09 September 16 0.297%
10 September 18 0.297%

Exclude February 29

U.S. birthday ranking, 1994–2014, by total births. Rank 1 is most common. All 366 dates included.
COMMONNESS RANK	BIRTHDAY	RECORDED BIRTHS	SHARE OF ALL BIRTHS	PER OCCURRENCE
#1	September 9	259,228	0.302%	12,344
#2	September 19	257,981	0.301%	12,285
#3	September 12	257,913	0.301%	12,282
#4	September 17	256,231	0.299%	12,201
#5	September 10	255,991	0.299%	12,190
#6	September 20	255,392	0.298%	12,162
#7	July 7	255,094	0.298%	12,147
#8	September 15	254,652	0.297%	12,126
#9	September 16	254,393	0.297%	12,114
#10	September 18	254,350	0.297%	12,112
#11	December 20	253,354	0.296%	12,064
#12	September 26	252,994	0.295%	12,047
#13	September 8	252,605	0.295%	12,029
#14	September 23	252,362	0.294%	12,017
#15	August 8	252,122	0.294%	12,006
#16	December 29	252,082	0.294%	12,004
#17	December 19	251,948	0.294%	11,998
#18	September 24	251,853	0.294%	11,993
#19	July 8	251,573	0.294%	11,980
#20	August 29	251,519	0.293%	11,977
#21	August 15	251,448	0.293%	11,974
#22	September 22	251,168	0.293%	11,960
#23	December 30	250,577	0.292%	11,932
#24	September 25	250,348	0.292%	11,921
#25	September 14	250,282	0.292%	11,918
#26	August 28	250,102	0.292%	11,910
#27	September 27	250,029	0.292%	11,906
#28	December 28	249,921	0.292%	11,901
#29	July 1	249,847	0.291%	11,897
#30	August 22	249,378	0.291%	11,875
#31	July 2	249,370	0.291%	11,875
#32	September 21	248,978	0.290%	11,856
#33	September 13	248,851	0.290%	11,850
#34	July 11	248,795	0.290%	11,847
#35	August 30	248,760	0.290%	11,846
#36	August 16	248,450	0.290%	11,831
#37	August 20	248,334	0.290%	11,825
#38	August 1	248,312	0.290%	11,824
#39	July 18	248,220	0.290%	11,820
#40	July 9	248,013	0.289%	11,810
#41	July 16	247,971	0.289%	11,808
#42	July 25	247,864	0.289%	11,803
#43	July 15	247,664	0.289%	11,794
#44	August 12	247,596	0.289%	11,790
#45	July 10	247,535	0.289%	11,787
#46	August 27	247,421	0.289%	11,782
#47	October 1	247,196	0.288%	11,771
#48	July 17	247,176	0.288%	11,770
#49	August 9	246,993	0.288%	11,762
#50	July 23	246,627	0.288%	11,744
#51	August 14	246,621	0.288%	11,744
#52	December 18	246,454	0.288%	11,736
#53	October 3	246,263	0.287%	11,727
#54	December 21	246,261	0.287%	11,727
#55	July 22	246,258	0.287%	11,727
#56	December 27	246,214	0.287%	11,724
#57	August 18	246,091	0.287%	11,719
#58	July 14	246,041	0.287%	11,716
#59	July 21	245,725	0.287%	11,701
#60	August 21	245,635	0.287%	11,697
#61	August 23	245,616	0.287%	11,696
#62	February 14	245,412	0.286%	11,686
#63	August 19	245,213	0.286%	11,677
#64	August 26	244,797	0.286%	11,657
#65	July 24	244,732	0.286%	11,654
#66	August 5	244,646	0.285%	11,650
#67	July 28	244,548	0.285%	11,645
#68	August 11	244,532	0.285%	11,644
#69	July 30	244,491	0.285%	11,642
#70	August 7	244,395	0.285%	11,638
#71	June 27	244,291	0.285%	11,633
#72	October 2	244,271	0.285%	11,632
#73	August 6	244,227	0.285%	11,630
#74	August 2	244,201	0.285%	11,629
#75	July 29	244,166	0.285%	11,627
#76	November 21	244,132	0.285%	11,625
#77	July 26	243,962	0.285%	11,617
#78	August 25	243,925	0.285%	11,615
#79	September 29	243,883	0.285%	11,613
#79	October 10	243,883	0.285%	11,613
#81	July 12	243,781	0.284%	11,609
#82	August 4	243,696	0.284%	11,605
#83	June 28	243,539	0.284%	11,597
#84	September 28	243,476	0.284%	11,594
#85	August 31	243,440	0.284%	11,592
#86	July 19	243,356	0.284%	11,588
#87	August 17	243,341	0.284%	11,588
#88	June 30	243,178	0.284%	11,580
#89	May 23	243,051	0.284%	11,574
#90	July 31	242,844	0.283%	11,564
#91	September 11	242,785	0.283%	11,561
#92	June 20	242,455	0.283%	11,545
#93	December 17	242,325	0.283%	11,539
#94	October 4	242,165	0.283%	11,532
#95	September 30	242,161	0.283%	11,531
#96	August 10	242,075	0.282%	11,527
#97	July 6	241,952	0.282%	11,522
#98	August 13	241,760	0.282%	11,512
#99	December 12	241,615	0.282%	11,505
#100	November 20	241,571	0.282%	11,503
#101	August 24	241,266	0.281%	11,489
#102	September 5	241,264	0.281%	11,489
#103	July 20	240,779	0.281%	11,466
#104	July 27	240,397	0.280%	11,447
#105	June 25	240,324	0.280%	11,444
#106	September 7	240,167	0.280%	11,437
#107	December 22	240,078	0.280%	11,432
#108	June 26	239,953	0.280%	11,426
#109	May 24	239,490	0.279%	11,404
#110	November 1	239,419	0.279%	11,401
#111	December 16	239,301	0.279%	11,395
#112	June 29	239,117	0.279%	11,387
#113	June 2	239,084	0.279%	11,385
#114	June 18	238,880	0.279%	11,375
#115	October 6	238,783	0.279%	11,371
#116	August 3	238,714	0.279%	11,367
#117	June 24	238,665	0.278%	11,365
#118	October 7	238,644	0.278%	11,364
#119	November 7	238,522	0.278%	11,358
#120	October 8	238,416	0.278%	11,353
#121	July 3	238,398	0.278%	11,352
#122	October 17	238,374	0.278%	11,351
#123	September 6	238,193	0.278%	11,343
#124	June 21	238,105	0.278%	11,338
#125	May 16	237,933	0.278%	11,330
#126	May 22	237,932	0.278%	11,330
#127	October 24	237,881	0.278%	11,328
#128	June 14	237,832	0.277%	11,325
#129	October 5	237,559	0.277%	11,312
#130	October 11	237,531	0.277%	11,311
#131	October 15	237,459	0.277%	11,308
#132	November 19	237,263	0.277%	11,298
#133	May 21	237,249	0.277%	11,298
#134	November 14	237,247	0.277%	11,297
#135	June 6	237,185	0.277%	11,295
#136	June 16	237,180	0.277%	11,294
#137	December 1	237,160	0.277%	11,293
#138	June 17	237,136	0.277%	11,292
#139	June 3	237,091	0.277%	11,290
#140	November 15	236,837	0.276%	11,278
#141	June 23	236,836	0.276%	11,278
#142	September 4	236,602	0.276%	11,267
#143	April 4	236,536	0.276%	11,264
#144	June 4	236,495	0.276%	11,262
#145	June 10	236,388	0.276%	11,257
#146	June 12	236,180	0.276%	11,247
#147	November 5	236,014	0.275%	11,239
#148	December 2	235,990	0.275%	11,238
#149	March 21	235,883	0.275%	11,233
#150	December 15	235,882	0.275%	11,232
#151	May 20	235,846	0.275%	11,231
#152	October 25	235,823	0.275%	11,230
#153	February 15	235,803	0.275%	11,229
#154	November 8	235,792	0.275%	11,228
#155	June 19	235,649	0.275%	11,221
#156	November 18	235,560	0.275%	11,217
#157	July 13	235,506	0.275%	11,215
#158	June 5	235,350	0.275%	11,207
#159	October 22	235,268	0.274%	11,203
#160	May 15	235,258	0.274%	11,203
#161	June 11	235,232	0.274%	11,202
#162	June 7	235,175	0.274%	11,199
#163	June 1	235,157	0.274%	11,198
#164	October 18	235,107	0.274%	11,196
#165	February 7	235,078	0.274%	11,194
#166	December 3	235,077	0.274%	11,194
#167	December 5	234,986	0.274%	11,190
#168	October 9	234,977	0.274%	11,189
#168	October 14	234,977	0.274%	11,189
#170	November 11	234,814	0.274%	11,182
#171	March 17	234,700	0.274%	11,176
#172	November 4	234,620	0.274%	11,172
#173	November 17	234,592	0.274%	11,171
#174	November 3	234,543	0.274%	11,169
#175	October 16	234,508	0.274%	11,167
#176	March 1	234,495	0.274%	11,166
#177	September 3	234,424	0.273%	11,163
#178	May 17	234,418	0.273%	11,163
#179	June 22	234,413	0.273%	11,163
#180	March 14	234,368	0.273%	11,160
#181	May 2	234,364	0.273%	11,160
#182	February 22	234,170	0.273%	11,151
#183	October 28	233,982	0.273%	11,142
#184	November 6	233,852	0.273%	11,136
#185	March 7	233,850	0.273%	11,136
#186	November 2	233,690	0.273%	11,128
#187	November 12	233,581	0.273%	11,123
#188	March 3	233,405	0.272%	11,115
#189	June 9	233,388	0.272%	11,114
#190	June 15	233,329	0.272%	11,111
#191	May 10	233,301	0.272%	11,110
#192	May 14	233,287	0.272%	11,109
#193	October 20	233,282	0.272%	11,109
#194	May 5	233,270	0.272%	11,108
#195	April 11	233,219	0.272%	11,106
#196	February 8	233,186	0.272%	11,104
#197	February 28	233,125	0.272%	11,101
#198	October 23	233,099	0.272%	11,100
#199	October 21	233,044	0.272%	11,097
#200	January 24	233,021	0.272%	11,096
#201	March 28	232,864	0.272%	11,089
#202	June 13	232,756	0.272%	11,084
#203	May 9	232,748	0.272%	11,083
#204	November 10	232,574	0.271%	11,075
#205	January 10	232,521	0.271%	11,072
#206	October 27	232,423	0.271%	11,068
#207	January 4	232,354	0.271%	11,064
#208	November 16	232,328	0.271%	11,063
#209	March 20	232,226	0.271%	11,058
#210	June 8	232,223	0.271%	11,058
#211	October 29	232,185	0.271%	11,056
#212	February 21	232,134	0.271%	11,054
#213	February 11	232,129	0.271%	11,054
#213	March 15	232,129	0.271%	11,054
#215	February 10	232,075	0.271%	11,051
#216	April 2	232,037	0.271%	11,049
#217	October 12	232,009	0.271%	11,048
#218	March 12	232,001	0.271%	11,048
#219	May 12	231,981	0.271%	11,047
#220	May 1	231,969	0.271%	11,046
#221	April 18	231,942	0.271%	11,045
#222	September 2	231,887	0.271%	11,042
#223	April 25	231,879	0.271%	11,042
#224	December 4	231,793	0.270%	11,038
#225	May 19	231,664	0.270%	11,032
#226	March 4	231,560	0.270%	11,027
#227	January 11	231,414	0.270%	11,020
#228	March 5	231,388	0.270%	11,018
#229	March 8	231,350	0.270%	11,017
#230	January 14	231,343	0.270%	11,016
#231	February 25	231,342	0.270%	11,016
#232	March 25	231,202	0.270%	11,010
#233	December 10	231,087	0.270%	11,004
#234	December 6	231,084	0.270%	11,004
#235	March 22	231,059	0.270%	11,003
#236	May 8	231,046	0.270%	11,002
#237	February 2	230,984	0.269%	10,999
#238	January 25	230,897	0.269%	10,995
#239	April 12	230,877	0.269%	10,994
#240	December 14	230,859	0.269%	10,993
#241	January 5	230,826	0.269%	10,992
#242	March 18	230,793	0.269%	10,990
#243	May 6	230,678	0.269%	10,985
#244	May 7	230,637	0.269%	10,983
#245	February 16	230,634	0.269%	10,983
#246	February 18	230,532	0.269%	10,978
#247	January 12	230,499	0.269%	10,976
#248	March 10	230,444	0.269%	10,974
#249	February 1	230,364	0.269%	10,970
#250	October 26	230,333	0.269%	10,968
#251	March 11	230,308	0.269%	10,967
#252	March 6	230,287	0.269%	10,966
#253	November 9	230,266	0.269%	10,965
#254	January 7	230,233	0.269%	10,963
#255	September 1	230,216	0.269%	10,963
#256	February 23	230,208	0.269%	10,962
#257	March 19	230,048	0.268%	10,955
#258	January 17	230,038	0.268%	10,954
#259	March 24	229,992	0.268%	10,952
#260	April 16	229,950	0.268%	10,950
#261	February 12	229,853	0.268%	10,945
#262	May 3	229,832	0.268%	10,944
#263	April 3	229,823	0.268%	10,944
#264	December 11	229,817	0.268%	10,944
#265	February 4	229,815	0.268%	10,944
#266	May 30	229,810	0.268%	10,943
#267	April 17	229,783	0.268%	10,942
#268	January 6	229,776	0.268%	10,942
#269	February 24	229,723	0.268%	10,939
#270	March 27	229,682	0.268%	10,937
#271	April 19	229,650	0.268%	10,936
#272	April 5	229,626	0.268%	10,935
#273	February 20	229,574	0.268%	10,932
#274	December 8	229,572	0.268%	10,932
#275	March 26	229,546	0.268%	10,931
#276	May 18	229,518	0.268%	10,929
#277	February 9	229,501	0.268%	10,929
#278	January 31	229,472	0.268%	10,927
#279	January 18	229,465	0.268%	10,927
#280	April 8	229,415	0.268%	10,925
#281	April 26	229,337	0.268%	10,921
#282	April 15	229,306	0.268%	10,919
#283	January 23	229,163	0.267%	10,913
#284	April 22	229,100	0.267%	10,910
#285	March 29	229,032	0.267%	10,906
#286	December 13	228,959	0.267%	10,903
#287	April 23	228,914	0.267%	10,901
#288	February 27	228,866	0.267%	10,898
#289	November 30	228,854	0.267%	10,898
#290	December 9	228,743	0.267%	10,893
#291	April 7	228,673	0.267%	10,889
#292	February 17	228,667	0.267%	10,889
#293	April 24	228,662	0.267%	10,889
#294	October 19	228,654	0.267%	10,888
#295	February 3	228,433	0.267%	10,878
#296	January 26	228,394	0.266%	10,876
#297	January 28	228,365	0.266%	10,875
#298	April 9	228,334	0.266%	10,873
#299	October 30	228,305	0.266%	10,872
#300	April 10	228,294	0.266%	10,871
#301	January 3	228,259	0.266%	10,869
#302	January 21	228,190	0.266%	10,866
#303	January 20	228,138	0.266%	10,864
#304	May 25	228,090	0.266%	10,861
#305	January 27	228,012	0.266%	10,858
#306	April 21	227,759	0.266%	10,846
#307	April 14	227,723	0.266%	10,844
#308	March 2	227,660	0.266%	10,841
#309	February 6	227,576	0.266%	10,837
#310	May 28	227,501	0.265%	10,833
#311	April 28	227,450	0.265%	10,831
#312	May 29	227,287	0.265%	10,823
#313	November 29	226,988	0.265%	10,809
#314	March 31	226,937	0.265%	10,807
#315	March 16	226,912	0.265%	10,805
#316	March 9	226,813	0.265%	10,801
#317	October 13	226,792	0.265%	10,800
#318	November 13	226,740	0.265%	10,797
#319	January 30	226,669	0.264%	10,794
#320	December 7	226,439	0.264%	10,783
#321	May 11	226,257	0.264%	10,774
#322	April 30	226,221	0.264%	10,772
#323	March 23	226,193	0.264%	10,771
#324	February 26	226,182	0.264%	10,771
#325	April 29	226,108	0.264%	10,767
#326	May 31	225,906	0.264%	10,757
#327	April 20	225,694	0.263%	10,747
#328	May 4	225,674	0.263%	10,746
#329	March 30	225,599	0.263%	10,743
#330	January 19	225,387	0.263%	10,733
#331	May 13	225,316	0.263%	10,729
#332	February 5	225,276	0.263%	10,727
#333	May 27	225,130	0.263%	10,720
#334	January 22	225,098	0.263%	10,719
#335	February 19	224,904	0.262%	10,710
#336	November 22	224,885	0.262%	10,709
#337	March 13	224,642	0.262%	10,697
#338	April 27	224,583	0.262%	10,694
#339	January 9	224,116	0.261%	10,672
#340	January 16	224,055	0.261%	10,669
#340	April 6	224,055	0.261%	10,669
#342	January 13	223,803	0.261%	10,657
#343	January 8	223,766	0.261%	10,656
#344	February 13	223,590	0.261%	10,647
#345	January 29	222,831	0.260%	10,611
#346	January 15	222,374	0.259%	10,589
#347	July 5	219,284	0.256%	10,442
#348	December 31	219,101	0.256%	10,433
#349	May 26	218,924	0.255%	10,425
#350	April 13	218,741	0.255%	10,416
#351	December 23	218,051	0.254%	10,383
#352	April 1	217,042	0.253%	10,335
#353	November 28	212,951	0.248%	10,141
#354	November 26	211,935	0.247%	10,092
#355	November 24	211,117	0.246%	10,053
#356	October 31	210,629	0.246%	10,030
#357	November 25	210,021	0.245%	10,001
#358	November 23	208,301	0.243%	9,919
#359	November 27	205,164	0.239%	9,770
#360	December 26	201,577	0.235%	9,599
#361	January 2	196,481	0.229%	9,356
#362	July 4	185,315	0.216%	8,825
#363	December 24	170,166	0.199%	8,103
#364	January 1	164,362	0.192%	7,827
#365	December 25	138,628	0.162%	6,601
#366	February 29	52,561	0.061%	10,512

366 of 366 dates · #1 is most common · Ties share a rank. Shares always use all recorded births, including February 29.

The births-by-day-of-month study groups every 1st, 2nd, and so on across months. It answers a different question from this month-and-day ranking.

Why is September 9 the most common birthday?

September 9 is first by total births in these historical U.S. records. It accounts for 259,228 births, or 0.3024% of all births recorded from 1994 through 2014.

The lead is close. September 9 has 1,247 more births than runner-up September 19, a margin of 0.48%. September 9 occurred 21 times during the study and averaged 12,344.2 births per occurrence.

The five dates with the most recorded births. U.S. records, 1994 through 2014; 21 occurrences each.
Birthday	Rank	Recorded births	Births per occurrence
September 9	1	259,228	12,344.2
September 19	2	257,981	12,284.8
September 12	3	257,913	12,281.6
September 17	4	256,231	12,201.5
September 10	5	255,991	12,190.0

The counts tell us which date leads and by how much. They cannot tell us why it leads or what happened in any individual pregnancy or delivery.

Why do September dates fill so many of the top spots?

September accounts for 9 of the top 10 birthday dates and 13 of the top 20 in this series. September 9 is part of a cluster, but the counts alone do not explain why the cluster occurs.

Birth patterns vary with the season, but the peak is not the same everywhere. A study of monthly births across U.S. states from 1931 through 2008 found regional differences in both timing and strength. Its authors said the mechanisms remain poorly understood. Their study helps put the September cluster in context; it cannot identify why September 9 tops this particular ranking.

Is September also the most common birth month?

By total births, August is first. September is first by average births per calendar day. August has an extra day each year, which matters when comparing totals. The birth-months guide shows both measures.

Try another birthday question

Use the birthday checker to find another date's rank and share. The birthday paradox calculator answers a different question: how likely is it that any pair in a room shares a birthday, compared with someone matching your own date?

Sources and limits

The ranking and table come from FiveThirtyEight's historical U.S. birth files: CDC/NCHS for 1994 through 1999, then SSA for 2000 through 2014. The methodology explains how we handle their overlapping years.

The figures describe births recorded in that period. They cannot give a current or worldwide birthday ranking or count how many living people share September 9.

Does September 9 lead every year?

An overall ranking can hide differences between years. Our year-by-year birthday study shows each year's winner and how September 9 compares, using the consistent SSA series from 2000 through 2014. Its source period differs from the combined 1994 through 2014 ranking on this page.

The calendar behind the ranking.

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September 19 #2 of 366 · 0.301% of recorded births

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The rarer side of the calendar

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The bigger monthly picture

Compare months on equal footing.