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   2025  +1 +5

6,012,561 people lived in Colorado on July 1, 2025: the 20th-largest population among the 50 states and the District of Columbia. The median age was 38.0 years (United States: 39.4); more residents are 65 or older (17.1%) than under 15 (16.6%): an ageing, top-heavy pyramid. There were 100.9 men for every 100 women. Since 2010 the population has grown by 19.1%. 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, 2025
Population
6,012,561
Rank by population
20th of 51
Median age
38.0
Men per 100 women
100.9
Under 15
16.6%
15–64
66.3%
65 and over
17.1%
Child dependency
25.0
Old-age dependency
25.8
Change since 2010
+19.1%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2025
AgeMenWomenTotalShare
0-4163,274154,648317,9225.3%
5-9167,669161,859329,5285.5%
10-14178,225170,991349,2165.8%
15-19195,864183,230379,0946.3%
20-24211,534193,990405,5246.7%
25-29235,439223,717459,1567.6%
30-34252,480232,344484,8248.1%
35-39240,417223,659464,0767.7%
40-44217,671206,341424,0127.1%
45-49187,560181,904369,4646.1%
50-54172,657168,451341,1085.7%
55-59162,649163,237325,8865.4%
60-64161,506172,057333,5635.5%
65-69153,656169,076322,7325.4%
70-74129,882146,933276,8154.6%
75-7997,364111,994209,3583.5%
80-8453,16067,437120,5972.0%
85+39,15460,53299,6861.7%
How Colorado compares with similar-sized states, 2025
RankStateResidentsRelative
17 Indiana 6,973,333
18 Missouri 6,270,541
19 Maryland 6,265,347
20 Colorado 6,012,561
21 Wisconsin 5,972,787
22 Minnesota 5,830,405
23 South Carolina 5,570,274
Frequently asked questions about Colorado's population
What is the population of Colorado?
Colorado had an estimated 6,012,561 residents on July 1, 2025, according to the U.S. Census Bureau, Population Estimates Program. That ranks 20th among the 51 states and the District of Columbia.
What is the median age in Colorado?
The median age in Colorado was 38.0 years in 2025, the 43rd oldest of the 51 states and DC. That is 1.4 years younger than the national median of 39.4.
How many people in Colorado are 65 or older?
About 1,029,188 residents of Colorado (17.1%) were 65 or older in 2025, against 16.6% under 15 and 66.3% aged 15 to 64.
What does the population pyramid of Colorado show?
In 2025, Colorado: more residents are 65 or older (17.1%) than under 15 (16.6%): an ageing, top-heavy pyramid. There were 100.9 men for every 100 women.
How fast is the population of Colorado changing?
The population of Colorado grew by 19.1% between 2010 and 2025, and by 0.4% in the last year.
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