This Is the Most Common Birthday in the U.S.
William Howard
Updated on February 22, 2026
Who doesn't love their birthday? It's a whole special celebration just for you—or so you'd like to think. In reality, many other people were born on the same day as you. And some birthdays (and birth months) are much more common than you'd expect. Using the most recent decade-long data from the Social Security Administration and the Centers for Disease Control and Prevention (CDC)'s National Center for Health Statistics, the career research company Zippia created a heat map of the most popular birthdays. It turns out that, on average, more babies were born in September than any other month. (The holidays, which are nine months prior, must be a busy time for couples!) To find out which exact date of birth is the most common and how many people share your birthday, read on. And if you were born before the new millennium, you'll likely recognize these Photos That Kids Born After 2000 Will Never Understand.
20 August 29
Average number of births per year: 11,924
And for more throwback phrases you wish were still cool, check out the Slang Terms From the 20th Century No One Uses Anymore.
19 December 19
Average number of births per year: 11,935
18 July 8
Average number of births per year: 11,944
And for more fun memories from decades past, check out The Best Slang Terms From the 1990s That Aren't Cool Today.
17 September 24
Average number of births per year: 11,945
16 August 8
Average number of births per year: 11,951
15 December 29
Average number of births per year: 11,956
14 September 23
Average number of births per year: 11,974
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13 September 8
Average number of births per year: 11,992
12 September 26
Average number of births per year: 11,993
11 December 20
Average number of births per year: 12,009
10 September 18
Average number of births per year: 12,055
9 September 16
Average number of births per year: 12,072
8 September 15
Average number of births per year: 12,087
7 September 20
Average number of births per year: 12,107
6 July 7
Average number of births per year: 12,108
5 September 10
Average number of births per year: 12,143
4 September 17
Average number of births per year: 12,148
3 September 12
Average number of births per year: 12,224
2 September 19
Average number of births per year: 12,229
1 September 9
Average number of births per year: 12,301
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