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   2011  +1 +5

5,121,900 people lived in Colorado on July 1, 2011: the 22nd-largest population among the 50 states and the District of Columbia. The median age was 36.2 years (United States: 37.3); children under 15 (20.2%) clearly outnumber residents 65 and older (11.2%): a relatively young population. There were 100.5 men for every 100 women. Since 2010 the population has grown by 1.5%. 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, 2011
Population
5,121,900
Rank by population
22nd of 51
Median age
36.2
Men per 100 women
100.5
Under 15
20.2%
15–64
68.6%
65 and over
11.2%
Child dependency
29.4
Old-age dependency
16.4
Change since 2010
+1.5%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2011
AgeMenWomenTotalShare
0-4175,527166,564342,0916.7%
5-9179,680172,040351,7206.9%
10-14173,444166,290339,7346.6%
15-19176,178164,108340,2866.6%
20-24184,924171,041355,9656.9%
25-29196,109184,691380,8007.4%
30-34188,855179,478368,3337.2%
35-39178,326168,291346,6176.8%
40-44182,214174,629356,8437.0%
45-49179,667179,672359,3397.0%
50-54185,829189,393375,2227.3%
55-59166,691172,569339,2606.6%
60-64142,556147,881290,4375.7%
65-6993,434100,377193,8113.8%
70-7463,16771,412134,5792.6%
75-7944,52154,29998,8201.9%
80-8431,18543,80774,9921.5%
85+24,47148,58073,0511.4%
How Colorado compares with similar-sized states, 2011
RankStateResidentsRelative
19 Maryland 5,840,241
20 Wisconsin 5,705,840
21 Minnesota 5,346,620
22 Colorado 5,121,900
23 Alabama 4,799,642
24 South Carolina 4,672,655
25 Louisiana 4,576,244
Frequently asked questions about Colorado's population
What is the population of Colorado?
Colorado had an estimated 5,121,900 residents on July 1, 2011, 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 36.2 years in 2011, the 42nd oldest of the 51 states and DC. That is 1.1 years younger than the national median of 37.3.
How many people in Colorado are 65 or older?
About 575,253 residents of Colorado (11.2%) were 65 or older in 2011, against 20.2% under 15 and 68.6% aged 15 to 64.
What does the population pyramid of Colorado show?
In 2011, Colorado: children under 15 (20.2%) clearly outnumber residents 65 and older (11.2%): a relatively young population. There were 100.5 men for every 100 women.
How fast is the population of Colorado changing?
The population of Colorado grew by 1.5% between 2010 and 2011, and by 1.5% in the last year.
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