Data / Rankings / Uninsured rate, ages 18 to 64 (US model-based estimate) / Counties in Connecticut

Counties in Connecticut by uninsured rate, ages 18 to 64 (US model-based estimate)

Greater Bridgeport Planning Region had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 9 counties in 2023, at 11.9%. Lower Connecticut River Valley Planning Region had the lowest, at 5.1%. The median was 7.2% and the figure for Connecticut was 7.9%. Source: the U.S. Census Bureau.

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Highest11.9Greater Bridgeport Planning Region
Lowest5.1Lower Connecticut River Valley Planning Region
Median7.29 counties
Connecticut7.9History

Map of counties, 2023

Capitol Planning Region: 6.9 %Greater Bridgeport Planning Region: 11.9 %Lower Connecticut River Valley Planning Region: 5.1 %Naugatuck Valley Planning Region: 7.3 %Northeastern Connecticut Planning Region: 5.8 %Northwest Hills Planning Region: 7.4 %South Central Connecticut Planning Region: 7.2 %Southeastern Connecticut Planning Region: 6.4 %Western Connecticut Planning Region: 10.2 %
  • Under 6.2
  • 6.2 to 7
  • 7 to 7.3
  • 7.3 to 8.5
  • 8.5 and over
%, 2023. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2023

Greater Bridgeport Planning Region: 11.9 %Greater Bridgeport Planning Region11.9Western Connecticut Planning Region: 10.2 %Western Connecticut Planning Regi…10.2Northwest Hills Planning Region: 7.4 %Northwest Hills Planning Region7.4Naugatuck Valley Planning Region: 7.3 %Naugatuck Valley Planning Region7.3South Central Connecticut Planning Region: 7.2 %South Central Connecticut Plannin…7.2Capitol Planning Region: 6.9 %Capitol Planning Region6.9Southeastern Connecticut Planning Region: 6.4 %Southeastern Connecticut Planning…6.4Northeastern Connecticut Planning Region: 5.8 %Northeastern Connecticut Planning…5.8Lower Connecticut River Valley Planning Region: 5.1 %Lower Connecticut River Valley Pl…5.1Greater Bridgeport Planning Region: 11.9 %Greater Bridgeport Planning Region11.9Western Connecticut Planning Region: 10.2 %Western Connecticut Planning Region10.2Northwest Hills Planning Region: 7.4 %Northwest Hills Planning Region7.4Naugatuck Valley Planning Region: 7.3 %Naugatuck Valley Planning Region7.3South Central Connecticut Planning Region: 7.2 %South Central Connecticut Planning Region7.2Capitol Planning Region: 6.9 %Capitol Planning Region6.9Southeastern Connecticut Planning Region: 6.4 %Southeastern Connecticut Planning Region6.4Northeastern Connecticut Planning Region: 5.8 %Northeastern Connecticut Planning Region5.8Lower Connecticut River Valley Planning Region: 5.1 %Lower Connecticut River Valley Planning Region5.1
%. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Greater Bridgeport Planning Region11.9+2.5 pts
2Western Connecticut Planning Region10.2+2.2 pts
3Northwest Hills Planning Region7.4+0.9 pts
4Naugatuck Valley Planning Region7.3-0.2 pts
5South Central Connecticut Planning Region7.2+0.5 pts
6Capitol Planning Region6.9+0.2 pts
7Southeastern Connecticut Planning Region6.4-0.6 pts
8Northeastern Connecticut Planning Region5.8-0.2 pts
9Lower Connecticut River Valley Planning Region5.1+0.2 pts

Other periods

About this ranking

People aged 18 to 64 without health insurance coverage of any kind, as a percentage of all people aged 18 to 64. United States: Census Bureau Small Area Health Insurance Estimates (SAHIE) for states and counties, all races, both sexes and all income levels.

A model-based single-year estimate that combines the American Community Survey with administrative records and population estimates, so every county gets a figure. Covers states and counties only, because the SAHIE dataset files have no national row. The Census Bureau advises comparing years from 2008 on only; 2013 is the updated release. Working-age adults; the rate for everyone under 65 is uninsured_rate_under_65.

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. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2023-csv.zip. 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). Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties (Counties in Connecticut by uninsured rate, ages 18 to 64 (US model-based estimate), 2023) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2023-csv.zip

MLA 9

Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties, Counties in Connecticut by uninsured rate, ages 18 to 64 (US model-based estimate), 2023. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2023-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/connecticut-counties?period=2023. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Counties in Connecticut by uninsured rate, ages 18 to 64 (US model-based estimate), 2023. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2023-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/connecticut-counties?period=2023.

Harvard

U.S. Census Bureau (2026) Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties, Counties in Connecticut by uninsured rate, ages 18 to 64 (US model-based estimate), 2023 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2023-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/connecticut-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_connecticut_by_2023,
  author = {{U.S. Census Bureau}},
  title = {{Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties: Counties in Connecticut by uninsured rate, ages 18 to 64 (US model-based estimate), 2023}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2023-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/connecticut-counties?period=2023. Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2023-csv.zip. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties: Counties in Connecticut by uninsured rate, ages 18 to 64 (US model-based estimate), 2023
PY  - 2026
DA  - 2026/08/06
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2023-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/connecticut-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/connecticut-counties?period=2023.
N1  - Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2023-csv.zip. Retrieved 2026-10-12.
ER  -
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Rank Counties in Connecticut by uninsured rate, ages 18 to 64 (US model-based estimate) using official data, and cite the source.
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Questions

Which county has the highest uninsured rate, ages 18 to 64 (US model-based estimate)?

Greater Bridgeport Planning Region, with 11.9% in 2023, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, ages 18 to 64 (US model-based estimate)?

Lower Connecticut River Valley Planning Region, with 5.1% in 2023.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, ages 18 to 64, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Uninsured rate, ages 18 to 64 (US model-based estimate): other rankings

Counties in Connecticut: more rankings