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)

Prince George's County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 24 counties in 2018, at 13.5%. Calvert County had the lowest, at 4.4%. The median was 7.4% and the figure for Maryland was 8.3%. Source: the U.S. Census Bureau.

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Highest13.5Prince George's County
Lowest4.4Calvert County
Median7.424 counties
Maryland8.3History

Map of counties, 2018

Allegany County: 6.4 %Anne Arundel County: 5.8 %Baltimore County: 7.3 %Calvert County: 4.4 %Caroline County: 9.8 %Carroll County: 5 %Cecil County: 6.2 %Charles County: 5.5 %Dorchester County: 8.7 %Frederick County: 6.6 %Garrett County: 8 %Harford County: 5.5 %Howard County: 5 %Kent County: 9 %Montgomery County: 9.6 %Prince George's County: 13.5 %Queen Anne's County: 6.1 %St. Mary's County: 6.3 %Somerset County: 8.9 %Talbot County: 8.6 %Washington County: 7.4 %Wicomico County: 9.5 %Worcester County: 8.1 %Baltimore city: 8.9 %
  • Under 5.7
  • 5.7 to 6.4
  • 6.4 to 8.1
  • 8.1 to 8.9
  • 8.9 and over
%, 2018. 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, 2018

Prince George's County: 13.5 %Prince George's County13.5Caroline County: 9.8 %Caroline County9.8Montgomery County: 9.6 %Montgomery County9.6Wicomico County: 9.5 %Wicomico County9.5Kent County: 9 %Kent County9Baltimore city: 8.9 %Baltimore city8.9Somerset County: 8.9 %Somerset County8.9Dorchester County: 8.7 %Dorchester County8.7Talbot County: 8.6 %Talbot County8.6Worcester County: 8.1 %Worcester County8.1Garrett County: 8 %Garrett County8Washington County: 7.4 %Washington County7.4Baltimore County: 7.3 %Baltimore County7.3Frederick County: 6.6 %Frederick County6.6Allegany County: 6.4 %Allegany County6.4St. Mary's County: 6.3 %St. Mary's County6.3Cecil County: 6.2 %Cecil County6.2Queen Anne's County: 6.1 %Queen Anne's County6.1Anne Arundel County: 5.8 %Anne Arundel County5.8Charles County: 5.5 %Charles County5.5Harford County: 5.5 %Harford County5.5Carroll County: 5 %Carroll County5Howard County: 5 %Howard County5Calvert County: 4.4 %Calvert County4.4Prince George's County: 13.5 %Prince George's County13.5Caroline County: 9.8 %Caroline County9.8Montgomery County: 9.6 %Montgomery County9.6Wicomico County: 9.5 %Wicomico County9.5Kent County: 9 %Kent County9Baltimore city: 8.9 %Baltimore city8.9Somerset County: 8.9 %Somerset County8.9Dorchester County: 8.7 %Dorchester County8.7Talbot County: 8.6 %Talbot County8.6Worcester County: 8.1 %Worcester County8.1Garrett County: 8 %Garrett County8Washington County: 7.4 %Washington County7.4Baltimore County: 7.3 %Baltimore County7.3Frederick County: 6.6 %Frederick County6.6Allegany County: 6.4 %Allegany County6.4St. Mary's County: 6.3 %St. Mary's County6.3Cecil County: 6.2 %Cecil County6.2Queen Anne's County: 6.1 %Queen Anne's County6.1Anne Arundel County: 5.8 %Anne Arundel County5.8Charles County: 5.5 %Charles County5.5Harford County: 5.5 %Harford County5.5Carroll County: 5 %Carroll County5Howard County: 5 %Howard County5Calvert County: 4.4 %Calvert County4.4
%. 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

RankCounties2018 (%)Change on 2017
1Prince George's County13.5+0.8 pts
2Caroline County9.8-0.1 pts
3Montgomery County9.60 pts
4Wicomico County9.5-0.2 pts
5Kent County9-0.3 pts
6Baltimore city8.9-0.1 pts
6Somerset County8.9-1 pts
8Dorchester County8.7+0.1 pts
9Talbot County8.6-1 pts
10Worcester County8.1-0.8 pts
11Garrett County8-0.5 pts
12Washington County7.4+0.1 pts
13Baltimore County7.3+0.1 pts
14Frederick County6.6+0.3 pts
15Allegany County6.4-0.4 pts
16St. Mary's County6.3+0.4 pts
17Cecil County6.2-0.3 pts
18Queen Anne's County6.1+0.2 pts
19Anne Arundel County5.8-0.9 pts
20Charles County5.5-0.3 pts
20Harford County5.50 pts
22Carroll County5-0.3 pts
22Howard County5+0.6 pts
24Calvert County4.4-0.2 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-2018-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), 2018) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-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), 2018. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2018. 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), 2018. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2018.

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), 2018 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maryland_by_2018,
  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), 2018}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2018. 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-2018-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), 2018
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-2018-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2018.
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-2018-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 13.5% in 2018, 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 4.4% in 2018.

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