birthday traffic

How common is a January 20 birthday?

Published by Birthday Traffic · · Sources and method

January 20

Uncommon

Rarer than 82.7%of other birthday dates.

1 in 376births in this sample share your birthday.

how rare is yours?birthdaytraffic.com

  • 10,864births in an average year21 years observed
  • 97%of a typical day11,175 births on an average day
  • #12 of 12January as a month10,721 births per day
  • −0.8%share of births, then to nowfirst five vs last five observed years

January 20 is the 303rd most common birthday of the 366 dates in this collection, and the 64th rarest. It records 228,138 births out of 85,712,738, so roughly 1 in 376 people in this sample were born on it.

It is more common than 17.3% of the other 365 dates and rarer than 82.7%, which puts it in the top 25% rarest birthdays. It records 97.2% of an average day’s count in the sample.

January 20 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 January 20 marked.

January 20 among all 366 datesAll 366 dates sorted from most to least common by recorded U.S. births 1994–2014, coloured by rarity tier, with January 20 marked.0100,000200,000300,000Very common: 91 dates, ranks #1–#91Very commonCommon: 92 dates, ranks #92–#183CommonUncommon: 147 dates, ranks #184–#330UncommonRare: 18 dates, ranks #331–#348Very rare: 15 dates, ranks #349–#363Super rare: 3 dates, ranks #364–#366#303 January 20: 228,138January 20 · #303 of 366most commonleast common
Very common 91Common 92Uncommon 147Rare 18Very rare 15Super rare 3All 366 dates from most to least common, coloured by the six rarity tiers; January 20 is marked. Recorded U.S. births, 1994–2014.

January 20 against the days around it

Recorded U.S. births, January window, 1994–2014
DateTotal birthsRank of 366
January 17230,038#258
January 18229,465#279
January 19225,387#330
January 20 (this date)228,138#303
January 21228,190#302
January 22225,098#334
January 23229,163#283

January as a whole records 10,721 births per day, ranked #12 of 12 months. Month ranking · January 19 · January 21

Has January 20 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 275.4 per 100,000; over the last five, 273.3 per 100,000 (-0.8%).

January 20 as a share of each year’s U.S. births, 1994–2014

Births on January 20 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.

January 20 as a share of each year’s U.S. births, 1994–2014Births on January 20 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.150200250300350SSA file from 2000first five: 275.4last five: 273.319941996199820002002200420062008201020122014per 100,000, 1994: 295.5 per 100,000per 100,000, 1995: 294.4 per 100,000per 100,000, 1996: 218.2 per 100,000per 100,000, 1997: 269.1 per 100,000per 100,000, 1998: 299.5 per 100,000per 100,000, 1999: 300.6 per 100,000per 100,000, 2000: 301.4 per 100,000per 100,000, 2001: 213.4 per 100,000per 100,000, 2002: 182.0 per 100,000per 100,000, 2003: 265.3 per 100,000per 100,000, 2004: 306.0 per 100,000per 100,000, 2005: 305.0 per 100,000per 100,000, 2006: 300.8 per 100,000per 100,000, 2007: 196.3 per 100,000per 100,000, 2008: 173.5 per 100,000per 100,000, 2009: 308.6 per 100,000per 100,000, 2010: 308.5 per 100,000per 100,000, 2011: 309.0 per 100,000per 100,000, 2012: 297.8 per 100,000per 100,000, 2013: 176.2 per 100,000per 100,000, 2014: 274.9 per 100,000per 100,000
The dotted line marks the change from the CDC/NCHS file to the SSA file.
January 20 as a share of that year's U.S. births
YearBirths on this datePer 100,000 births
199411,682295.5
199511,481294.4
19968,492218.2
199710,444269.1
199811,806299.5
199911,901300.6
200012,506301.4
20018,771213.4
20027,462182.0
200311,045265.3
200412,810306.0
200512,847305.0
200613,040300.8
20078,600196.3
20087,481173.5
200912,935308.6
201012,514308.5
201112,382309.0
201211,914297.8
20137,001176.2
201411,024274.9

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, January 20 ranked #191 of 366 with 9,535 births per occurrence. The 1969–1988 calendar and what changed since.

January 20 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.

January 20 rank and intensity, 2007–2014
CountryRank of 366Index (100 = average day)
United States#34393.0
England & Wales#29597.7
Denmark#32593.2
Metropolitan France#26997.9
Malaysia#35392.6

In the matched window the U.S. rank is #343; over the full 1994–2014 collection it is #303. 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, 16,442 have this birthday, one resident in 366. A count of people living there, wherever they were born. How many people in Denmark share a birthday.

Born on January 20

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.

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.

Keep going

Open the January 20 card →

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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