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   2018  +1 +5

5,697,155 people lived in Colorado on July 1, 2018: the 21st-largest population among the 50 states and the District of Columbia. The median age was 36.9 years (United States: 38.2); children under 15 (18.4%) clearly outnumber residents 65 and older (14.2%): a relatively young population. There were 101.4 men for every 100 women. Since 2010 the population has grown by 12.9%. Source: U.S. Census Bureau, Population Estimates Program, Vintage 2020 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, 2018
Population
5,697,155
Rank by population
21st of 51
Median age
36.9
Men per 100 women
101.4
Under 15
18.4%
15–64
67.4%
65 and over
14.2%
Child dependency
27.3
Old-age dependency
21.0
Change since 2010
+12.9%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2018
AgeMenWomenTotalShare
0-4170,104163,866333,9705.9%
5-9178,658170,382349,0406.1%
10-14186,894178,803365,6976.4%
15-19186,380175,603361,9836.4%
20-24198,076179,980378,0566.6%
25-29238,190217,021455,2118.0%
30-34230,968211,354442,3227.8%
35-39214,674201,824416,4987.3%
40-44187,658177,660365,3186.4%
45-49187,976179,405367,3816.4%
50-54171,261171,062342,3236.0%
55-59179,902187,592367,4946.5%
60-64166,793176,783343,5766.0%
65-69138,297149,767288,0645.1%
70-74101,465111,105212,5703.7%
75-7961,37672,801134,1772.4%
80-8437,10847,96785,0751.5%
85+32,39556,00588,4001.6%
How Colorado compares with similar-sized states, 2018
RankStateResidentsRelative
18 Missouri 6,125,986
19 Maryland 6,042,153
20 Wisconsin 5,809,319
21 Colorado 5,697,155
22 Minnesota 5,608,762
23 South Carolina 5,091,702
24 Alabama 4,891,628
Frequently asked questions about Colorado's population
What is the population of Colorado?
Colorado had an estimated 5,697,155 residents on July 1, 2018, 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 36.9 years in 2018, the 41st oldest of the 51 states and DC. That is 1.3 years younger than the national median of 38.2.
How many people in Colorado are 65 or older?
About 808,286 residents of Colorado (14.2%) were 65 or older in 2018, against 18.4% under 15 and 67.4% aged 15 to 64.
What does the population pyramid of Colorado show?
In 2018, Colorado: children under 15 (18.4%) clearly outnumber residents 65 and older (14.2%): a relatively young population. There were 101.4 men for every 100 women.
How fast is the population of Colorado changing?
The population of Colorado grew by 12.9% between 2010 and 2018, and by 1.4% in the last year.
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