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

Counties in Maryland by uninsured rate, ages 18 to 64 (US model-based estimate), 2024

Prince George's County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 24 counties in 2024, at 13.1%. Calvert County had the lowest, at 4.6%. The median was 7.8% and the figure for Maryland was 8.4%. Source: the U.S. Census Bureau.

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Highest13.1Prince George's County
Lowest4.6Calvert County
Median7.824 counties
Maryland8.4History

Map of counties, 2024

Allegany County: 7.5 %Anne Arundel County: 6.3 %Baltimore County: 7.7 %Calvert County: 4.6 %Caroline County: 11 %Carroll County: 5.1 %Cecil County: 6.5 %Charles County: 5.6 %Dorchester County: 9.4 %Frederick County: 6.3 %Garrett County: 8.6 %Harford County: 5 %Howard County: 5.7 %Kent County: 8.8 %Montgomery County: 9.6 %Prince George's County: 13.1 %Queen Anne's County: 6.9 %St. Mary's County: 5.7 %Somerset County: 8.8 %Talbot County: 8.8 %Washington County: 8.7 %Wicomico County: 9.5 %Worcester County: 7.8 %Baltimore city: 8.7 %
  • Under 5.7
  • 5.7 to 7
  • 7 to 8.7
  • 8.7 to 9
  • 9 and over
%, 2024. 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, 2024

Prince George's County: 13.1 %Prince George's County13.1Caroline County: 11 %Caroline County11Montgomery County: 9.6 %Montgomery County9.6Wicomico County: 9.5 %Wicomico County9.5Dorchester County: 9.4 %Dorchester County9.4Kent County: 8.8 %Kent County8.8Somerset County: 8.8 %Somerset County8.8Talbot County: 8.8 %Talbot County8.8Baltimore city: 8.7 %Baltimore city8.7Washington County: 8.7 %Washington County8.7Garrett County: 8.6 %Garrett County8.6Worcester County: 7.8 %Worcester County7.8Baltimore County: 7.7 %Baltimore County7.7Allegany County: 7.5 %Allegany County7.5Queen Anne's County: 6.9 %Queen Anne's County6.9Cecil County: 6.5 %Cecil County6.5Anne Arundel County: 6.3 %Anne Arundel County6.3Frederick County: 6.3 %Frederick County6.3Howard County: 5.7 %Howard County5.7St. Mary's County: 5.7 %St. Mary's County5.7Charles County: 5.6 %Charles County5.6Carroll County: 5.1 %Carroll County5.1Harford County: 5 %Harford County5Calvert County: 4.6 %Calvert County4.6Prince George's County: 13.1 %Prince George's County13.1Caroline County: 11 %Caroline County11Montgomery County: 9.6 %Montgomery County9.6Wicomico County: 9.5 %Wicomico County9.5Dorchester County: 9.4 %Dorchester County9.4Kent County: 8.8 %Kent County8.8Somerset County: 8.8 %Somerset County8.8Talbot County: 8.8 %Talbot County8.8Baltimore city: 8.7 %Baltimore city8.7Washington County: 8.7 %Washington County8.7Garrett County: 8.6 %Garrett County8.6Worcester County: 7.8 %Worcester County7.8Baltimore County: 7.7 %Baltimore County7.7Allegany County: 7.5 %Allegany County7.5Queen Anne's County: 6.9 %Queen Anne's County6.9Cecil County: 6.5 %Cecil County6.5Anne Arundel County: 6.3 %Anne Arundel County6.3Frederick County: 6.3 %Frederick County6.3Howard County: 5.7 %Howard County5.7St. Mary's County: 5.7 %St. Mary's County5.7Charles County: 5.6 %Charles County5.6Carroll County: 5.1 %Carroll County5.1Harford County: 5 %Harford County5Calvert County: 4.6 %Calvert County4.6
%. 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

RankCounties2024 (%)Change on 2023
1Prince George's County13.10 pts
2Caroline County11+0.9 pts
3Montgomery County9.6+0.2 pts
4Wicomico County9.5-0.3 pts
5Dorchester County9.4+0.1 pts
6Kent County8.8+1.1 pts
6Somerset County8.8+0.6 pts
6Talbot County8.8+0.7 pts
9Baltimore city8.7+0.5 pts
9Washington County8.7+0.2 pts
11Garrett County8.6-0.2 pts
12Worcester County7.8+0.2 pts
13Baltimore County7.7+0.4 pts
14Allegany County7.5+0.5 pts
15Queen Anne's County6.9+0.6 pts
16Cecil County6.5+0.6 pts
17Anne Arundel County6.3-0.1 pts
17Frederick County6.3-0.4 pts
19Howard County5.7+0.5 pts
19St. Mary's County5.7-0.2 pts
21Charles County5.6-0.3 pts
22Carroll County5.1+0.2 pts
23Harford County5-0.4 pts
24Calvert County4.60 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-2024-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 Maryland by uninsured rate, ages 18 to 64 (US model-based estimate), 2024) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-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 Maryland by uninsured rate, ages 18 to 64 (US model-based estimate), 2024. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties. 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 Maryland by uninsured rate, ages 18 to 64 (US model-based estimate), 2024. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties.

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 Maryland by uninsured rate, ages 18 to 64 (US model-based estimate), 2024 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maryland_by_2024,
  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 Maryland by uninsured rate, ages 18 to 64 (US model-based estimate), 2024}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2024-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties. 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-2024-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 Maryland by uninsured rate, ages 18 to 64 (US model-based estimate), 2024
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-2024-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties.
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-2024-csv.zip. Retrieved 2026-10-12.
ER  -
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Questions

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

Prince George's County, with 13.1% in 2024, according to the U.S. Census Bureau.

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

Calvert County, with 4.6% in 2024.

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 Maryland: more rankings