The most common birthday in the United States is September 9. This date consistently ranks as the top birthday in multiple data analyses, including those compiled by FiveThirtyEight and reported by various sources such as Happiest Baby, The Bump, and USA Today. Around 12,000 babies are born on this day each year, making it the most frequent birthday
. Interestingly, nine of the ten most common birthdays fall in September, with only one date outside September-July 7-making the top 10 list. The concentration of birthdays in September is often attributed to conceptions occurring around the holiday season in late November and December
. While September 9 is the single most common birthday, August is actually the most common birth month overall, followed by July and then September
. In summary:
- Most common birthday: September 9
- Other common birthdays: Mostly in September (e.g., September 12, 15, 16, 17, 18, 19, 20) and July 7
- Most common birth month: August
- Reason: Likely linked to conceptions during the holiday season
Famous people born on September 9 include Adam Sandler, Michelle Williams, Hugh Grant, Michael Bublé, and Bill Murray
