How common is a September 9 birthday?
September 9
Top 10 most common
Most common birthday
More common than 100%of other birthday dates.
1 in 331births in this sample share your birthday.
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September 9 is the 1st most common birthday of the 366 dates in this collection, and the 366th rarest. It records 259,228 births out of 85,712,738, so roughly 1 in 331 people in this sample were born on it.
It is more common than 100.0% of the other 365 dates and rarer than 0.0%. It records 110.5% of an average day’s count in the sample.
September 9 among all 366 dates
All 366 dates sorted from most to least common by recorded U.S. births 1994–2014, coloured by rarity tier, with September 9 marked.
September 9 against the days around it
| Date | Total births | Rank of 366 | |
|---|---|---|---|
| September 6 | 238,193 | #123 | |
| September 7 | 240,167 | #106 | |
| September 8 | 252,605 | #13 | |
| September 9 (this date) | 259,228 | #1 | |
| September 10 | 255,991 | #5 | |
| September 11 | 242,785 | #91 | |
| September 12 | 257,913 | #3 |
September as a whole records 11,811 births per day, ranked #1 of 12 months. Month ranking · September 8 · September 10
Has September 9 changed over time?
Annual U.S. birth totals changed across this window, so a raw daily count moves with the size of the year. The chart uses each year's share of that year's births instead, in births per 100,000. Averaged over the first five observed years it is 306.7 per 100,000; over the last five, 308.6 per 100,000 (+0.6%).
September 9 as a share of each year’s U.S. births, 1994–2014
Births on September 9 per 100,000 births in that year, one point per year, with the change of source at 2000 marked and the first-five and last-five year means drawn as bands.
| Year | Births on this date | Per 100,000 births | |
|---|---|---|---|
| 1994 | 12,811 | 324.1 | |
| 1995 | 9,714 | 249.1 | |
| 1996 | 11,543 | 296.6 | |
| 1997 | 12,457 | 321.0 | |
| 1998 | 13,501 | 342.5 | |
| 1999 | 14,540 | 367.2 | |
| 2000 | 9,860 | 237.6 | |
| 2001 | 8,347 | 203.0 | |
| 2002 | 12,875 | 314.1 | |
| 2003 | 13,869 | 333.1 | |
| 2004 | 14,526 | 346.9 | |
| 2005 | 14,505 | 344.4 | |
| 2006 | 9,759 | 225.1 | |
| 2007 | 8,389 | 191.5 | |
| 2008 | 14,567 | 337.9 | |
| 2009 | 16,081 | 383.7 | |
| 2010 | 14,135 | 348.5 | |
| 2011 | 13,537 | 337.8 | |
| 2012 | 7,930 | 198.2 | |
| 2013 | 12,653 | 318.4 | |
| 2014 | 13,629 | 339.8 |
Source break: 1994–1999 counts come from the CDC/NCHS daily file and 2000–2014 from the Social Security Administration daily file. The overlapping years 2000–2003 are taken from the SSA file only, so each year is counted once. But the step at 2000 is a change of source as well as a change of year, and any comparison across it includes that change.
The weekday the date fell on, scheduling practice and recording practice are all inside these lines.
A generation earlier, in the separate daily file for 1969–1988, September 9 ranked #7 of 366 with 10,527 births per occurrence. The 1969–1988 calendar and what changed since.
September 9 in five countries
Countries are compared only over the matched years 2007–2014, which all five sources cover completely, and using births per occurrence so that leap day is handled the same way everywhere. Each country's records are counted on their own.
| Country | Rank of 366 | Index (100 = average day) | |
|---|---|---|---|
| United States | #11 | 111.9 | |
| England & Wales | #39 | 104.0 | |
| Denmark | #66 | 105.3 | |
| Metropolitan France | #89 | 102.6 | |
| Malaysia | #2 | 114.6 |
In the matched window the U.S. rank is #11; over the full 1994–2014 collection it is #1. The two numbers answer different questions and usually differ for two reasons at once: the window is eight years against twenty-one, and the metric is births per occurrence against the total across the whole period. Every figure on this page names its window and its metric. Full five-country study.
Among the 6,025,603 people living in Denmark on January 1, 2026, 16,608 have this birthday, one resident in 363. A count of people living there, wherever they were born. How many people in Denmark share a birthday.
Born on September 9
12 people from the English Wikipedia “On this day” birth lists, oldest first. A reading list. Every birth figure on this page comes from the national records.
- Tom Wopat1951American actor and singer
- Walter Davis1954–2023American basketball player
- Hugh Grant1960English actor
- Adam Sandler1966American actor and comedian
- Akshay Kumar1967Indian actor and film producer
- Julia Sawalha1968British actress
- Henry Thomas1971American actor
- Mattias Öhlund1976Swedish ice hockey player
- Michelle Williams1980American actress
- J. R. Smith1985American basketball player
- Andrea Petkovic1987German tennis player
- Will Middlebrooks1988American baseball player
Names and descriptions from English Wikipedia, CC BY-SA 4.0, retrieved 2026-09-11; curated arts/science/sport entries, years 1800–2008. not a celebrity census. conflicting identities excluded.
How this date was explored here
Site usage. Between September 11, 2026 at 07:05 UTC and September 15, 2026 at 10:38 Pacific time, 1,964 tab sessions looked up September 9 on this site. 1,694 of them started there and 270 arrived after checking a different date first. The picker opens pre-filled on this date, so its first-request count is biased upward.
Counts are tab sessions. Checked dates are the dates people looked up. The rarity figures above come from birth records. How these counts were made · Open the September 9 card
Keep going
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Sources, method and limits
Main ranking: 85,712,738 recorded U.S. births on 7,670 calendar dates, 1994–2014. CDC/NCHS daily counts for 1994–1999 and Social Security Administration daily counts for 2000–2014, as compiled by FiveThirtyEight and attributed under CC BY 4.0. The overlapping years 2000–2003 are counted once.
Ranks compare totals across the 366 observed month-and-day dates. February 29 occurred 5 times in this window; every other date occurred 21 times, so per-occurrence figures are used wherever seasonality is compared.
Every figure above comes from the administrative records named here, at the granularity those records publish: a day, a month or a year. Coverage and definitions differ between countries and eras, so two sources are combined only where their documentation states the windows are separate, and the page where that happens says so.
Full method, leap-day treatment and definitions.
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