What was the most common birthday in 2011?

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

November 11most births in 2011a Friday, 14,392 births
December 25fewest births in 2011a Sunday, 5,728 births
Augustbusiest month per day11,748 births per day
Tuesdaybusiest weekday12,857 per day against 7,114 on Sunday

In 2011 the United States recorded 4,006,908 births over 365 days, 10,978 on an average day. The busiest single date was November 11, a Friday, with 14,392 births; the quietest was December 25, a Sunday, with 5,728. Within one year every date has one weekday, so the weekday column below is a fact of that date.

Every day of 2011: recorded U.S. births

Every day of 2011 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 2011

Dates of 2011 with the most recorded U.S. births
Date	Weekday	Births	% of an average day
November 11	Friday	14,392	131.1
September 7	Wednesday	14,234	129.7
July 7	Thursday	14,200	129.4
July 6	Wednesday	13,950	127.1
September 1	Thursday	13,723	125.0
September 20	Tuesday	13,648	124.3
December 20	Tuesday	13,640	124.3
November 1	Tuesday	13,632	124.2
September 14	Wednesday	13,590	123.8
September 15	Thursday	13,583	123.7

The quietest dates of 2011

Dates of 2011 with the fewest recorded U.S. births
Date	Weekday	Births	% of an average day
December 25	Sunday	5,728	52.2
January 2	Sunday	6,540	59.6
March 13	Sunday	6,557	59.7
April 24	Sunday	6,570	59.8
December 24	Saturday	6,688	60.9
December 11	Sunday	6,832	62.2
February 13	Sunday	6,853	62.4
April 10	Sunday	6,861	62.5
October 30	Sunday	6,870	62.6
March 27	Sunday	6,871	62.6

2011 by weekday and by month

Weekend days in 2011 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.

2011: births per day by weekday

Seven columns, Monday to Sunday, average recorded births per day in 2011.

2011: births per day by weekday
Weekday	Days	Births per day
Tuesday	52	12,857
Wednesday	52	12,594
Thursday	52	12,489
Friday	52	12,205
Monday	52	11,557
Saturday	53	8,085
Sunday	52	7,114

2011: births per day by month
Month	Births	Births per day
August	364,194	11,748
September	350,662	11,689
June	341,637	11,388
July	349,841	11,285
November	326,107	10,870
March	334,439	10,788
February	301,927	10,783
October	333,132	10,746
December	332,232	10,717
May	330,667	10,667
April	317,225	10,574
January	324,845	10,479

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Sources, method and limits

Source for 2011: 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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