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   2017  +1 +5

3,575,324 people lived in Connecticut on July 1, 2017: the 29th-largest population among the 50 states and the District of Columbia. The median age was 40.9 years (United States: 38.0); children (16.9%) and older adults (16.8%) make up similar shares of the population. There were 95.2 men for every 100 women. Since 2010 the population has shrunk by 0.1%. 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, 2017
Population
3,575,324
Rank by population
29th of 51
Median age
40.9
Men per 100 women
95.2
Under 15
16.9%
15–64
66.3%
65 and over
16.8%
Child dependency
25.4
Old-age dependency
25.3
Change since 2010
-0.1%
Dependency ratios count children under 15 or adults 65 and over per 100 residents aged 15 to 64.
Show the population by age group, 2017
AgeMenWomenTotalShare
0-493,89689,998183,8945.1%
5-9101,87597,409199,2845.6%
10-14111,980108,112220,0926.2%
15-19124,396119,702244,0986.8%
20-24127,021119,221246,2426.9%
25-29114,026106,489220,5156.2%
30-34110,579110,113220,6926.2%
35-39105,839109,469215,3086.0%
40-44100,417105,799206,2165.8%
45-49117,694125,152242,8466.8%
50-54129,559137,771267,3307.5%
55-59131,362139,924271,2867.6%
60-64114,615122,907237,5226.6%
65-6988,03399,562187,5955.2%
70-7468,65781,003149,6604.2%
75-7943,83156,09399,9242.8%
80-8429,00742,10071,1072.0%
85+31,03460,67991,7132.6%
How Connecticut compares with similar-sized states, 2017
RankStateResidentsRelative
26 Kentucky 4,455,590
27 Oregon 4,147,294
28 Oklahoma 3,933,602
29 Connecticut 3,575,324
30 Iowa 3,143,734
31 Utah 3,103,540
32 Arkansas 3,003,855
Frequently asked questions about Connecticut's population
What is the population of Connecticut?
Connecticut had an estimated 3,575,324 residents on July 1, 2017, 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 40.9 years in 2017, the 6th oldest of the 51 states and DC. That is 2.9 years older than the national median of 38.0.
How many people in Connecticut are 65 or older?
About 599,999 residents of Connecticut (16.8%) were 65 or older in 2017, against 16.9% under 15 and 66.3% aged 15 to 64.
What does the population pyramid of Connecticut show?
In 2017, Connecticut: children (16.9%) and older adults (16.8%) make up similar shares of the population. There were 95.2 men for every 100 women.
How fast is the population of Connecticut changing?
The population of Connecticut shrank by 0.1% between 2010 and 2017, and by -0.1% in the last year.
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