What was the most common birthday in 2005?

Published by Birthday Traffic · September 15, 2026 · Sources and method

September 7most births in 2005a Wednesday, 14,744 births
December 25fewest births in 2005a Sunday, 6,224 births
Septemberbusiest month per day12,345 births per day
Tuesdaybusiest weekday13,439 per day against 7,476 on Sunday

In 2005 the United States recorded 4,211,941 births over 365 days, 11,540 on an average day. The busiest single date was September 7, a Wednesday, with 14,744 births; the quietest was December 25, a Sunday, with 6,224. Within one year every date has one weekday, so the weekday column below is a fact of that date.

Every day of 2005: recorded U.S. births

Every day of 2005 in calendar order as one line, with the busiest and quietest dates marked and the year’s average day drawn across it.

The regular dips are weekends. The deepest dips are fixed holidays.

The busiest dates of 2005

Dates of 2005 with the most recorded U.S. births
Date	Weekday	Births	% of an average day
September 7	Wednesday	14,744	127.8
September 8	Thursday	14,740	127.7
December 20	Tuesday	14,659	127.0
July 7	Thursday	14,627	126.8
September 20	Tuesday	14,590	126.4
July 6	Wednesday	14,562	126.2
September 9	Friday	14,505	125.7
December 28	Wednesday	14,381	124.6
May 5	Thursday	14,357	124.4
September 15	Thursday	14,263	123.6

The quietest dates of 2005

Dates of 2005 with the fewest recorded U.S. births
Date	Weekday	Births	% of an average day
December 25	Sunday	6,224	53.9
January 2	Sunday	6,871	59.5
March 27	Sunday	6,923	60.0
April 3	Sunday	7,065	61.2
January 9	Sunday	7,169	62.1
January 16	Sunday	7,192	62.3
November 27	Sunday	7,197	62.4
April 17	Sunday	7,214	62.5
May 1	Sunday	7,230	62.7
March 13	Sunday	7,239	62.7

2005 by weekday and by month

Weekend days in 2005 recorded 62% of a weekday’s births per day. The quietest dates above are mostly weekend days and fixed holidays; the busiest are weekdays in late summer. The counts show the association.

2005: births per day by weekday

Seven columns, Monday to Sunday, average recorded births per day in 2005.

2005: births per day by weekday
Weekday	Days	Births per day
Tuesday	52	13,439
Wednesday	52	13,296
Thursday	52	13,251
Friday	52	12,883
Monday	52	11,911
Saturday	53	8,577
Sunday	52	7,476

2005: births per day by month
Month	Births	Births per day
September	370,354	12,345
August	376,467	12,144
June	356,576	11,886
July	363,196	11,716
March	355,121	11,456
December	354,720	11,443
November	342,182	11,406
May	351,736	11,346
October	351,161	11,328
April	338,060	11,269
February	314,890	11,246
January	337,478	10,886

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Sources, method and limits

Source for 2005: Social Security Administration daily births for the United States, as compiled by FiveThirtyEight (CC BY 4.0). The 2000–2003 overlap between the two files is taken from the SSA file only. Weekday is taken from the record’s calendar date. Ranks within a year compare single days.

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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