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   2015  +1 +5

5,454,328 people lived in Colorado on July 1, 2015: the 22nd-largest population among the 50 states and the District of Columbia. The median age was 36.5 years (United States: 37.8); children under 15 (19.3%) clearly outnumber residents 65 and older (13.0%): a relatively young population. There were 101.0 men for every 100 women. Since 2010 the population has grown by 8.1%. 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, 2015
Population
5,454,328
Rank by population
22nd of 51
Median age
36.5
Men per 100 women
101.0
Under 15
19.3%
15–64
67.8%
65 and over
13.0%
Child dependency
28.4
Old-age dependency
19.2
Change since 2010
+8.1%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2015
AgeMenWomenTotalShare
0-4171,513163,956335,4696.2%
5-9182,982173,773356,7556.5%
10-14183,112175,641358,7536.6%
15-19179,359168,368347,7276.4%
20-24200,352180,104380,4567.0%
25-29215,593199,793415,3867.6%
30-34213,074198,969412,0437.6%
35-39192,610183,222375,8326.9%
40-44185,707175,021360,7286.6%
45-49177,627172,566350,1936.4%
50-54181,551185,100366,6516.7%
55-59179,413185,503364,9166.7%
60-64156,100165,370321,4705.9%
65-69126,612134,709261,3214.8%
70-7480,70490,451171,1553.1%
75-7951,75761,925113,6822.1%
80-8433,93144,95278,8831.4%
85+29,29953,60982,9081.5%
How Colorado compares with similar-sized states, 2015
RankStateResidentsRelative
19 Maryland 5,988,528
20 Wisconsin 5,762,927
21 Minnesota 5,484,002
22 Colorado 5,454,328
23 South Carolina 4,896,006
24 Alabama 4,854,803
25 Louisiana 4,666,998
Frequently asked questions about Colorado's population
What is the population of Colorado?
Colorado had an estimated 5,454,328 residents on July 1, 2015, according to the U.S. Census Bureau, Population Estimates Program. That ranks 22nd among the 51 states and the District of Columbia.
What is the median age in Colorado?
The median age in Colorado was 36.5 years in 2015, the 39th oldest of the 51 states and DC. That is 1.3 years younger than the national median of 37.8.
How many people in Colorado are 65 or older?
About 707,949 residents of Colorado (13.0%) were 65 or older in 2015, against 19.3% under 15 and 67.8% aged 15 to 64.
What does the population pyramid of Colorado show?
In 2015, Colorado: children under 15 (19.3%) clearly outnumber residents 65 and older (13.0%): a relatively young population. There were 101.0 men for every 100 women.
How fast is the population of Colorado changing?
The population of Colorado grew by 8.1% between 2010 and 2015, and by 1.9% in the last year.
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