Data / Rankings / Median age on 1 July (US county estimates) / Counties in Connecticut

Counties in Connecticut by median age on 1 July (US county estimates), 2025

Northwest Hills Planning Region had the highest median age on 1 July (US county estimates) of 9 counties in 2025, at 48.1 years. Greater Bridgeport Planning Region had the lowest, at 39.3 years. The median was 41.6 years. Source: the U.S. Census Bureau.

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Highest48.1Northwest Hills Planning Region
Lowest39.3Greater Bridgeport Planning Region
Median41.69 counties

Map of counties, 2025

Capitol Planning Region: 40.5 yearsGreater Bridgeport Planning Region: 39.3 yearsLower Connecticut River Valley Planning Region: 47 yearsNaugatuck Valley Planning Region: 42.3 yearsNortheastern Connecticut Planning Region: 44.2 yearsNorthwest Hills Planning Region: 48.1 yearsSouth Central Connecticut Planning Region: 40.4 yearsSoutheastern Connecticut Planning Region: 41.6 yearsWestern Connecticut Planning Region: 41.3 years
  • Under 40
  • 40 to 41
  • 41 to 42
  • 42 to 45
  • 45 and over
years, 2025. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2025

Northwest Hills Planning Region: 48.1 yearsNorthwest Hills Planning Region48.1Lower Connecticut River Valley Planning Region: 47 yearsLower Connecticut River Valley Pl…47Northeastern Connecticut Planning Region: 44.2 yearsNortheastern Connecticut Planning…44.2Naugatuck Valley Planning Region: 42.3 yearsNaugatuck Valley Planning Region42.3Southeastern Connecticut Planning Region: 41.6 yearsSoutheastern Connecticut Planning…41.6Western Connecticut Planning Region: 41.3 yearsWestern Connecticut Planning Regi…41.3Capitol Planning Region: 40.5 yearsCapitol Planning Region40.5South Central Connecticut Planning Region: 40.4 yearsSouth Central Connecticut Plannin…40.4Greater Bridgeport Planning Region: 39.3 yearsGreater Bridgeport Planning Region39.3Northwest Hills Planning Region: 48.1 yearsNorthwest Hills Planning Region48.1Lower Connecticut River Valley Planning Region: 47 yearsLower Connecticut River Valley Planning Region47Northeastern Connecticut Planning Region: 44.2 yearsNortheastern Connecticut Planning Region44.2Naugatuck Valley Planning Region: 42.3 yearsNaugatuck Valley Planning Region42.3Southeastern Connecticut Planning Region: 41.6 yearsSoutheastern Connecticut Planning Region41.6Western Connecticut Planning Region: 41.3 yearsWestern Connecticut Planning Region41.3Capitol Planning Region: 40.5 yearsCapitol Planning Region40.5South Central Connecticut Planning Region: 40.4 yearsSouth Central Connecticut Planning Region40.4Greater Bridgeport Planning Region: 39.3 yearsGreater Bridgeport Planning Region39.3
years. Source: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.

Full ranking

RankCounties2025
years		Change on 2024
1Northwest Hills Planning Region48.10
2Lower Connecticut River Valley Planning Region47+0.1
3Northeastern Connecticut Planning Region44.2+0.2
4Naugatuck Valley Planning Region42.3+0.2
5Southeastern Connecticut Planning Region41.6+0.2
6Western Connecticut Planning Region41.3+0.2
7Capitol Planning Region40.5+0.1
8South Central Connecticut Planning Region40.4+0.3
9Greater Bridgeport Planning Region39.3+0.3

Other periods

About this ranking

Age that divides the resident population of a US county into two halves of equal size on 1 July, from Census Bureau population estimates calculated by single year of age.

Counties only: the county file has no state or national medians, and medians cannot be added up. A single-year estimate, unlike median_age, which for US places is a five-year American Community Survey estimate.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage (Counties in Connecticut by median age on 1 July (US county estimates), 2025) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Connecticut by median age on 1 July (US county estimates), 2025. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/connecticut-counties. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Counties in Connecticut by median age on 1 July (US county estimates), 2025. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/connecticut-counties.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage, Counties in Connecticut by median age on 1 July (US county estimates), 2025 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/median-age-july-1-us-counties/connecticut-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_connecticut_by_2025,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Connecticut by median age on 1 July (US county estimates), 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/connecticut-counties. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN\_AGE\_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage: Counties in Connecticut by median age on 1 July (US county estimates), 2025
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/median-age-july-1-us-counties/connecticut-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-age-july-1-us-counties/connecticut-counties.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
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Rank Counties in Connecticut by median age on 1 July (US county estimates) using official data, and cite the source.
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Questions

Which county has the highest median age on 1 July (US county estimates)?

Northwest Hills Planning Region, with 48.1 years in 2025, according to the U.S. Census Bureau.

Which county has the lowest median age on 1 July (US county estimates)?

Greater Bridgeport Planning Region, with 39.3 years in 2025.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program, county population by age and sex: median age (MEDIAN_AGE_TOT) on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage. Retrieved 2026-10-12.

Median age on 1 July (US county estimates): other rankings

Counties in Connecticut: more rankings