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

Population of Connecticut, 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

3,607,765 people lived in Connecticut on July 1, 2021: the 29th-largest population among the 50 states and the District of Columbia. The median age was 41.1 years (United States: 38.9); more residents are 65 or older (18.4%) than under 15 (16.3%): an ageing, top-heavy pyramid. There were 94.2 men for every 100 women. Since 2010 the population has grown by 0.8%. 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
3,607,765
Rank by population
29th of 51
Median age
41.1
Men per 100 women
94.2
Under 15
16.3%
15–64
65.3%
65 and over
18.4%
Child dependency
25.0
Old-age dependency
28.2
Change since 2010
+0.8%
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
0-491,06887,514178,5824.9%
5-999,32895,316194,6445.4%
10-14110,168105,876216,0446.0%
15-19121,425118,586240,0116.7%
20-24119,602115,193234,7956.5%
25-29112,606109,603222,2096.2%
30-34116,096119,753235,8496.5%
35-39112,572117,809230,3816.4%
40-44105,463111,759217,2226.0%
45-49100,860108,658209,5185.8%
50-54117,633127,011244,6446.8%
55-59127,425136,758264,1837.3%
60-64122,448133,015255,4637.1%
65-69100,484111,644212,1285.9%
70-7478,41792,648171,0654.7%
75-7952,76166,469119,2303.3%
80-8431,75444,57476,3282.1%
85+30,07655,39385,4692.4%
How Connecticut compares with similar-sized states, 2021
RankStateResidentsRelative
26 Kentucky 4,508,348
27 Oregon 4,254,691
28 Oklahoma 3,992,760
29 Connecticut 3,607,765
30 Utah 3,339,874
31 Iowa 3,199,037
32 Nevada 3,148,472
Frequently asked questions about Connecticut's population
What is the population of Connecticut?
Connecticut had an estimated 3,607,765 residents on July 1, 2021, according to the U.S. Census Bureau, Population Estimates Program. That ranks 29th among the 51 states and the District of Columbia.
What is the median age in Connecticut?
The median age in Connecticut was 41.1 years in 2021, the 8th oldest of the 51 states and DC. That is 2.2 years older than the national median of 38.9.
How many people in Connecticut are 65 or older?
About 664,220 residents of Connecticut (18.4%) were 65 or older in 2021, against 16.3% under 15 and 65.3% aged 15 to 64.
What does the population pyramid of Connecticut show?
In 2021, Connecticut: more residents are 65 or older (18.4%) than under 15 (16.3%): an ageing, top-heavy pyramid. There were 94.2 men for every 100 women.
How fast is the population of Connecticut changing?
The population of Connecticut grew by 0.8% between 2010 and 2021, and by 0.8% in the last year.
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