The Most (And Least) Common Birthdays In The US

Summary

9 out of 10 of the most common birthdays are in September.

However, August is the most commmon birth month, with an average of 361,709 August babies each year in the United States.

February is the least common birth month, with avereage of 316,891 babies born in February annually.

Tuesday is the most common day of the week for births in America.

The highest percentage of births occur at 8 a.m. and noon.

There were 3,659,289 births in the United States in 2021

The ratio of sexes at birth is 1.05 males per 1 female in the U.S.

Happy birthday to you, and you, and many more.

It’s not uncommon to share a birthday with someone you know. Anyone who has ever had a communal office birthday cake knows some months the cake has more names iced on than others.

It turns out, it’s not just days that are more common, but some months (And one in particular!) are booming when it comes to births and some months when the delivery room is downright slow.

The 10 Most Popular Birthdays

September 9th
September 19th
September 12th
September 17th
September 10th
July 7th
September 20th
September 15th
September 16th
September 18th

September is a busy month for delivering babies! And for birthday cakes, party hats, and other birthday related accessories. 9 of the 10 most popular birthdays are in September. The one not in September? July 7th, just 3 days after Independence Day.

For those struggling to do the math, 9 months before these popular September birthdays is a slew of December dates, including December 25th.

Which is kind of funny, considering the least popular birth dates…

10 Least Popular Birthdays

December 25th
January 1st
December 24th
July 4th
January 2nd
December 26th
November 27th
November 23rd
November 25th
October 31st

While holidays are a popular time for baby making, babies are less likely to be born on popular holidays. Christmas, New Years, Christmas Eve, July 4th, Halloween, and some suspiciously Thanksgiving days all make the top 10 least common birthdays.

In a world of scheduled c-sections and inductions, doctors and delivery staff prefer to be home with their families on the big holidays than helping expand someone else’s families. Another day where births are less common? The 13th. Guess people are still superstitious about the “unlucky” day.

How We Determined This (And The Full Calendar)

To rank the most common birthdays, we used data aggregated by FiveThirtyEight on the number of births on each day between 1994 to 2014..

This data set took birth data for the years 1994 to 2003, from the Centers for Disease Control and Prevention’s National Center for Health Statistics. U.S. births data for births between 2000 to 2014 came from the Social Security Administration. The more babies born on average, the more common the birthday.

The calendar featured at the top of the article is a simple heat map of the data. The deeper the blue, the more people with that birth date. The deeper red, the less birth dates. It is worth noting that the deepest red is for months with no 31st day.

You can see the full calendar year and how common of a birthday your special day is below.

How common of a birth date is each day in the calendar year?

Birth Date	Popularity	Average Births
1/1	365th	7,792
1/2	362nd	9,307
1/3	306th	10,813
1/4	209th	11,019
1/5	237th	10,953
1/6	259th	10,911
1/7	255th	10,925
1/8	343rd	10,610
1/9	340th	10,624
1/10	207th	11,023
1/11	230th	10,975
1/12	248th	10,934
1/13	342nd	10,622
1/14	228th	10,976
1/15	346th	10,546
1/16	341st	10,623
1/17	264th	10,901
1/18	278th	10,883
1/19	332nd	10,691
1/20	301st	10,825
1/21	302nd	10,824
1/22	334th	10,673
1/23	285th	10,865
1/24	199th	11,049
1/25	240th	10,951
1/26	295th	10,843
1/27	303rd	10,823
1/28	297th	10,835
1/29	345th	10,567
1/30	318th	10,752
1/31	278th	10,883
2/1	251st	10,929
2/2	242nd	10,949
2/3	295th	10,843
2/4	261st	10,905
2/5	333rd	10,685
2/6	311th	10,794
2/7	164th	11,149
2/8	195th	11,063
2/9	272nd	10,893
2/10	211th	11,015
2/11	211th	11,015
2/12	269th	10,898
2/13	344th	10,604
2/14	63rd	11,636
2/15	150th	11,188
2/16	244th	10,948
2/17	291st	10,854
2/18	246th	10,940
2/19	334th	10,673
2/20	277th	10,886
2/21	216th	11,008
2/22	182nd	11,111
2/23	253rd	10,927
2/24	262nd	10,904
2/25	231st	10,974
2/26	325th	10,727
2/27	288th	10,858
2/28	198th	11,053
2/29	347th	10,462
3/1	174th	11,129
3/2	309th	10,802
3/3	190th	11,074
3/4	225th	10,989
3/5	227th	10,979
3/6	256th	10,921
3/7	184th	11,087
3/8	228th	10,976
3/9	316th	10,765
3/10	246th	10,940
3/11	249th	10,931
3/12	219th	11,003
3/13	338th	10,654
3/14	178th	11,119
3/15	215th	11,011
3/16	314th	10,773
3/17	169th	11,137
3/18	236th	10,954
3/19	258th	10,914
3/20	219th	11,003
3/21	153rd	11,181
3/22	233rd	10,967
3/23	322nd	10,739
3/24	256th	10,921
3/25	231st	10,974
3/26	276th	10,888
3/27	271st	10,895
3/28	201st	11,045
3/29	284th	10,873
3/30	328th	10,714
3/31	313th	10,779
4/1	353rd	10,300
4/2	217th	11,004
4/3	267th	10,899
4/4	144th	11,219
4/5	266th	10,900
4/6	339th	10,639
4/7	287th	10,859
4/8	275th	10,890
4/9	298th	10,830
4/10	300th	10,826
4/11	196th	11,059
4/12	237th	10,953
4/13	351st	10,389
4/14	307th	10,812
4/15	278th	10,883
4/16	260th	10,909
4/17	270th	10,897
4/18	217th	11,004
4/19	274th	10,891
4/20	328th	10,714
4/21	304th	10,817
4/22	283rd	10,877
4/23	286th	10,864
4/24	294th	10,845
4/25	224th	10,996
4/26	282nd	10,882
4/27	336th	10,664
4/28	308th	10,803
4/29	323rd	10,735
4/30	324th	10,731
5/1	221st	11,002
5/2	181st	11,113
5/3	263rd	10,903
5/4	327th	10,717
5/5	191st	11,073
5/6	242nd	10,949
5/7	245th	10,945
5/8	235th	10,955
5/9	203rd	11,040
5/10	192nd	11,071
5/11	319th	10,744
5/12	210th	11,016
5/13	330th	10,697
5/14	193rd	11,070
5/15	162nd	11,157
5/16	127th	11,283
5/17	177th	11,122
5/18	267th	10,899
5/19	223rd	10,999
5/20	147th	11,193
5/21	135th	11,254
5/22	125th	11,288
5/23	89th	11,525
5/24	109th	11,367
5/25	299th	10,827
5/26	349th	10,401
5/27	331st	10,693
5/28	310th	10,797
5/29	312th	10,782
5/30	264th	10,901
5/31	326th	10,719
6/1	158th	11,164
6/2	113th	11,345
6/3	133rd	11,256
6/4	143rd	11,221
6/5	158th	11,164
6/6	139th	11,240
6/7	160th	11,160
6/8	206th	11,025
6/9	185th	11,083
6/10	142nd	11,222
6/11	160th	11,160
6/12	146th	11,196
6/13	202nd	11,041
6/14	125th	11,288
6/15	188th	11,078
6/16	131st	11,265
6/17	136th	11,253
6/18	114th	11,339
6/19	156th	11,176
6/20	92nd	11,502
6/21	122nd	11,298
6/22	172nd	11,130
6/23	138th	11,244
6/24	117th	11,328
6/25	105th	11,406
6/26	108th	11,374
6/27	71st	11,590
6/28	82nd	11,557
6/29	111th	11,351
6/30	87th	11,547
7/1	27th	11,860
7/2	30th	11,828
7/3	121st	11,304
7/4	363rd	8,796
7/5	348th	10,404
7/6	96th	11,487
7/7	6th	12,108
7/8	18th	11,944
7/9	40th	11,769
7/10	45th	11,738
7/11	35th	11,794
7/12	81st	11,565
7/13	153rd	11,181
7/14	54th	11,680
7/15	43rd	11,754
7/16	41st	11,768
7/17	49th	11,718
7/18	38th	11,772
7/19	88th	11,545
7/20	103rd	11,428
7/21	59th	11,664
7/22	52nd	11,686
7/23	50th	11,699
7/24	68th	11,607
7/25	41st	11,768
7/26	74th	11,581
7/27	104th	11,410
7/28	65th	11,614
7/29	70th	11,593
7/30	69th	11,599
7/31	90th	11,516
8/1	37th	11,775
8/2	75th	11,580
8/3	116th	11,332
8/4	79th	11,569
8/5	66th	11,610
8/6	73rd	11,586
8/7	72nd	11,589
8/8	16th	11,951
8/9	47th	11,721
8/10	93rd	11,491
8/11	67th	11,608
8/12	44th	11,749
8/13	98th	11,468
8/14	51st	11,692
8/15	21st	11,921
8/16	36th	11,788
8/17	86th	11,548
8/18	53rd	11,681
8/19	62nd	11,637
8/20	39th	11,771
8/21	61st	11,643
8/22	31st	11,825
8/23	60th	11,655
8/24	99th	11,452
8/25	76th	11,576
8/26	64th	11,620
8/27	46th	11,737
8/28	28th	11,855
8/29	20th	11,924
8/30	34th	11,800
8/31	84th	11,555
9/1	250th	10,930
9/2	222nd	11,000
9/3	178th	11,119
9/4	145th	11,216
9/5	102nd	11,431
9/6	124th	11,293
9/7	106th	11,398
9/8	13th	11,992
9/9	1st	12,301
9/10	5th	12,143
9/11	91st	11,503
9/12	3rd	12,224
9/13	33rd	11,801
9/14	24th	11,882
9/15	8th	12,087
9/16	9th	12,072
9/17	4th	12,148
9/18	10th	12,055
9/19	2nd	12,229
9/20	7th	12,107
9/21	32nd	11,813
9/22	22nd	11,920
9/23	14th	11,974
9/24	17th	11,945
9/25	25th	11,866
9/26	12th	11,993
9/27	26th	11,861
9/28	85th	11,554
9/29	77th	11,572
9/30	95th	11,489
10/1	48th	11,720
10/2	77th	11,572
10/3	57th	11,674
10/4	94th	11,490
10/5	129th	11,272
10/6	115th	11,335
10/7	118th	11,324
10/8	119th	11,309
10/9	169th	11,137
10/10	83rd	11,556
10/11	130th	11,268
10/12	213th	11,014
10/13	315th	10,768
10/14	164th	11,149
10/15	132nd	11,261
10/16	180th	11,115
10/17	123rd	11,296
10/18	164th	11,149
10/19	292nd	10,850
10/20	194th	11,065
10/21	197th	11,057
10/22	163rd	11,156
10/23	200th	11,046
10/24	128th	11,276
10/25	151st	11,183
10/26	252nd	10,928
10/27	205th	11,032
10/28	183rd	11,102
10/29	214th	11,012
10/30	305th	10,815
10/31	357th	9,978
11/1	112th	11,350
11/2	186th	11,081
11/3	172nd	11,130
11/4	174th	11,129
11/5	148th	11,191
11/6	186th	11,081
11/7	120th	11,308
11/8	155th	11,180
11/9	253rd	10,927
11/10	204th	11,039
11/11	168th	11,141
11/12	189th	11,077
11/13	320th	10,742
11/14	139th	11,240
11/15	141st	11,229
11/16	208th	11,022
11/17	176th	11,125
11/18	157th	11,173
11/19	134th	11,255
11/20	100th	11,442
11/21	80th	11,567
11/22	336th	10,664
11/23	359th	9,883
11/24	356th	10,015
11/25	358th	9,954
11/26	355th	10,044
11/27	360th	9,718
11/28	354th	10,096
11/29	317th	10,764
11/30	289th	10,855
12/1	137th	11,251
12/2	152nd	11,182
12/3	167th	11,142
12/4	226th	10,981
12/5	171st	11,132
12/6	234th	10,958
12/7	321st	10,741
12/8	272nd	10,893
12/9	293rd	10,849
12/10	240th	10,951
12/11	278th	10,883
12/12	101st	11,440
12/13	289th	10,855
12/14	239th	10,952
12/15	148th	11,191
12/16	110th	11,352
12/17	97th	11,481
12/18	56th	11,675
12/19	19th	11,935
12/20	11th	12,009
12/21	54th	11,680
12/22	107th	11,388
12/23	352nd	10,338
12/24	364th	8,069
12/25	366th	6,574
12/26	361st	9,543
12/27	58th	11,665
12/28	28th	11,855
12/29	15th	11,956
12/30	23rd	11,889
12/31	350th	10,394

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Author

Kathy Morris

Kathy is the head of content at Zippia with a knack for engaging audiences. Prior to joining Zippia, Kathy worked at Gateway Blend growing audiences across diverse brands. She graduated from Troy University with a degree in Social Science Education.

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