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

Population of Colorado, 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

5,814,368 people lived in Colorado on July 1, 2021: the 21st-largest population among the 50 states and the District of Columbia. The median age was 37.4 years (United States: 38.9); children (17.7%) and older adults (15.6%) make up similar shares of the population. There were 100.8 men for every 100 women. Since 2010 the population has grown by 15.2%. 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
5,814,368
Rank by population
21st of 51
Median age
37.4
Men per 100 women
100.8
Under 15
17.7%
15–64
66.7%
65 and over
15.6%
Child dependency
26.5
Old-age dependency
23.3
Change since 2010
+15.2%
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
0-4161,266155,324316,5905.4%
5-9174,948167,402342,3505.9%
10-14189,926179,417369,3436.4%
15-19192,944180,992373,9366.4%
20-24201,218187,761388,9796.7%
25-29229,027212,003441,0307.6%
30-34238,615222,050460,6657.9%
35-39222,192209,071431,2637.4%
40-44197,042190,277387,3196.7%
45-49177,395171,210348,6056.0%
50-54176,420173,196349,6166.0%
55-59170,185175,878346,0636.0%
60-64171,081182,083353,1646.1%
65-69149,201162,654311,8555.4%
70-74121,215133,458254,6734.4%
75-7972,06584,155156,2202.7%
80-8441,57453,26694,8401.6%
85+33,15754,70087,8571.5%
How Colorado compares with similar-sized states, 2021
RankStateResidentsRelative
18 Maryland 6,176,035
19 Missouri 6,172,551
20 Wisconsin 5,882,128
21 Colorado 5,814,368
22 Minnesota 5,714,055
23 South Carolina 5,194,346
24 Alabama 5,050,058
Frequently asked questions about Colorado's population
What is the population of Colorado?
Colorado had an estimated 5,814,368 residents on July 1, 2021, according to the U.S. Census Bureau, Population Estimates Program. That ranks 21st among the 51 states and the District of Columbia.
What is the median age in Colorado?
The median age in Colorado was 37.4 years in 2021, the 43rd oldest of the 51 states and DC. That is 1.5 years younger than the national median of 38.9.
How many people in Colorado are 65 or older?
About 905,445 residents of Colorado (15.6%) were 65 or older in 2021, against 17.7% under 15 and 66.7% aged 15 to 64.
What does the population pyramid of Colorado show?
In 2021, Colorado: children (17.7%) and older adults (15.6%) make up similar shares of the population. There were 100.8 men for every 100 women.
How fast is the population of Colorado changing?
The population of Colorado grew by 15.2% between 2010 and 2021, and by 0.5% in the last year.
More pyramids
All US states Population pyramid of the United States AlabamaAlaskaArizonaArkansasCaliforniaConnecticutDelawareDistrict of ColumbiaFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyoming