Share of the population by age and sex, five-year groups

Population of District of Columbia, 2010–2025 · click to pick a year
Estimates up to 2019 are built on the 2010 Census, those from 2020 on the 2020 Census. A line that steps up or down between 2019 and 2020 reflects this re-basing, not a sudden change in population.

Year

-5 -1   2021  +1 +5

669,637 people lived in District of Columbia on July 1, 2021: the 49th-largest population among the 50 states and the District of Columbia. The median age was 34.3 years (United States: 38.9); children (15.7%) and older adults (13.0%) make up similar shares of the population. There were 88.1 men for every 100 women. Since 2010 the population has grown by 10.6%. Source: U.S. Census Bureau, Population Estimates Program, Vintage 2025 estimates (resident population on July 1; public domain). Median age, shares, dependency ratios and rankings are calculated by PopulationPyramid.net from these estimates; the Census Bureau does not endorse this site.

Key indicators, 2021
Population
669,637
Rank by population
49th of 51
Median age
34.3
Men per 100 women
88.1
Under 15
15.7%
15–64
71.3%
65 and over
13.0%
Child dependency
22.1
Old-age dependency
18.2
Change since 2010
+10.6%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2021
AgeMenWomenTotalShare
0-421,16820,07541,2436.2%
5-917,92417,15535,0795.2%
10-1414,73314,32229,0554.3%
15-1915,53917,47533,0144.9%
20-2423,16832,59655,7648.3%
25-2933,87341,65175,52411.3%
30-3435,53639,59475,13011.2%
35-3929,64531,45061,0959.1%
40-4421,60923,06544,6746.7%
45-4916,56217,55034,1125.1%
50-5416,26916,61332,8824.9%
55-5916,31917,12133,4405.0%
60-6415,00516,67531,6804.7%
65-6912,49415,36027,8544.2%
70-749,89713,40523,3023.5%
75-796,4119,17815,5892.3%
80-843,9745,9689,9421.5%
85+3,5946,66410,2581.5%
How District of Columbia compares with similar-sized states, 2021
RankStateResidentsRelative
45 Delaware 1,005,130
46 South Dakota 896,303
47 North Dakota 777,977
48 Alaska 734,590
49 District of Columbia 669,637
50 Vermont 647,238
51 Wyoming 579,662
Frequently asked questions about District of Columbia's population
What is the population of District of Columbia?
District of Columbia had an estimated 669,637 residents on July 1, 2021, according to the U.S. Census Bureau, Population Estimates Program. That ranks 49th among the 51 states and the District of Columbia.
What is the median age in District of Columbia?
The median age in District of Columbia was 34.3 years in 2021, the 50th oldest of the 51 states and DC. That is 4.6 years younger than the national median of 38.9.
How many people in District of Columbia are 65 or older?
About 86,945 residents of District of Columbia (13.0%) were 65 or older in 2021, against 15.7% under 15 and 71.3% aged 15 to 64.
What does the population pyramid of District of Columbia show?
In 2021, District of Columbia: children (15.7%) and older adults (13.0%) make up similar shares of the population. There were 88.1 men for every 100 women.
How fast is the population of District of Columbia changing?
The population of District of Columbia grew by 10.6% between 2010 and 2021, and by -0.2% in the last year.
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