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   2025  +1 +5

3,688,496 people lived in Connecticut on July 1, 2025: the 29th-largest population among the 50 states and the District of Columbia. The median age was 41.4 years (United States: 39.4); more residents are 65 or older (20.4%) than under 15 (15.8%): an ageing, top-heavy pyramid. There were 94.4 men for every 100 women. Since 2010 the population has grown by 3.1%. 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
3,688,496
Rank by population
29th of 51
Median age
41.4
Men per 100 women
94.4
Under 15
15.8%
15–64
63.8%
65 and over
20.4%
Child dependency
24.8
Old-age dependency
31.9
Change since 2010
+3.1%
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
0-493,88688,878182,7645.0%
5-999,17495,108194,2825.3%
10-14105,197101,195206,3925.6%
15-19120,725119,178239,9036.5%
20-24123,604119,446243,0506.6%
25-29116,086109,980226,0666.1%
30-34117,192118,203235,3956.4%
35-39122,643127,376250,0196.8%
40-44114,714121,378236,0926.4%
45-49105,031111,303216,3345.9%
50-54103,169111,767214,9365.8%
55-59114,548124,981239,5296.5%
60-64120,263131,626251,8896.8%
65-69109,208122,941232,1496.3%
70-7487,084100,705187,7895.1%
75-7964,94880,980145,9284.0%
80-8440,24554,77695,0212.6%
85+33,11057,84890,9582.5%
How Connecticut compares with similar-sized states, 2025
RankStateResidentsRelative
26 Kentucky 4,606,864
27 Oregon 4,273,586
28 Oklahoma 4,123,288
29 Connecticut 3,688,496
30 Utah 3,538,904
31 Nevada 3,282,188
32 Iowa 3,238,387
Frequently asked questions about Connecticut's population
What is the population of Connecticut?
Connecticut had an estimated 3,688,496 residents on July 1, 2025, 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 41.4 years in 2025, the 9th oldest of the 51 states and DC. That is 2.0 years older than the national median of 39.4.
How many people in Connecticut are 65 or older?
About 751,845 residents of Connecticut (20.4%) were 65 or older in 2025, against 15.8% under 15 and 63.8% aged 15 to 64.
What does the population pyramid of Connecticut show?
In 2025, Connecticut: more residents are 65 or older (20.4%) than under 15 (15.8%): an ageing, top-heavy pyramid. There were 94.4 men for every 100 women.
How fast is the population of Connecticut changing?
The population of Connecticut grew by 3.1% between 2010 and 2025, and by 0.4% in the last year.
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