Data / Rankings / Uninsured rate, under 65 (US model-based estimate) / Counties in Maryland

Counties in Maryland by uninsured rate, under 65 (US model-based estimate)

Prince George's County had the highest uninsured rate, under 65 (US model-based estimate) of 24 counties in 2021, at 10.8%. Calvert County had the lowest, at 4.4%. The median was 6.6% and the figure for Maryland was 7%. Source: the U.S. Census Bureau.

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Highest10.8Prince George's County
Lowest4.4Calvert County
Median6.624 counties
Maryland7History

Map of counties, 2021

Allegany County: 6.3 %Anne Arundel County: 5.5 %Baltimore County: 6.4 %Calvert County: 4.4 %Caroline County: 9.1 %Carroll County: 4.7 %Cecil County: 6.5 %Charles County: 5.2 %Dorchester County: 8.6 %Frederick County: 6.1 %Garrett County: 7.4 %Harford County: 5.1 %Howard County: 4.5 %Kent County: 8.5 %Montgomery County: 7.3 %Prince George's County: 10.8 %Queen Anne's County: 6.1 %St. Mary's County: 5.8 %Somerset County: 6.7 %Talbot County: 7.6 %Washington County: 6.8 %Wicomico County: 8.7 %Worcester County: 7.6 %Baltimore city: 6.9 %
  • Under 5.4
  • 5.4 to 6.3
  • 6.3 to 6.9
  • 6.9 to 8
  • 8 and over
%, 2021. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Prince George's County: 10.8 %Prince George's County10.8Caroline County: 9.1 %Caroline County9.1Wicomico County: 8.7 %Wicomico County8.7Dorchester County: 8.6 %Dorchester County8.6Kent County: 8.5 %Kent County8.5Talbot County: 7.6 %Talbot County7.6Worcester County: 7.6 %Worcester County7.6Garrett County: 7.4 %Garrett County7.4Montgomery County: 7.3 %Montgomery County7.3Baltimore city: 6.9 %Baltimore city6.9Washington County: 6.8 %Washington County6.8Somerset County: 6.7 %Somerset County6.7Cecil County: 6.5 %Cecil County6.5Baltimore County: 6.4 %Baltimore County6.4Allegany County: 6.3 %Allegany County6.3Frederick County: 6.1 %Frederick County6.1Queen Anne's County: 6.1 %Queen Anne's County6.1St. Mary's County: 5.8 %St. Mary's County5.8Anne Arundel County: 5.5 %Anne Arundel County5.5Charles County: 5.2 %Charles County5.2Harford County: 5.1 %Harford County5.1Carroll County: 4.7 %Carroll County4.7Howard County: 4.5 %Howard County4.5Calvert County: 4.4 %Calvert County4.4Prince George's County: 10.8 %Prince George's County10.8Caroline County: 9.1 %Caroline County9.1Wicomico County: 8.7 %Wicomico County8.7Dorchester County: 8.6 %Dorchester County8.6Kent County: 8.5 %Kent County8.5Talbot County: 7.6 %Talbot County7.6Worcester County: 7.6 %Worcester County7.6Garrett County: 7.4 %Garrett County7.4Montgomery County: 7.3 %Montgomery County7.3Baltimore city: 6.9 %Baltimore city6.9Washington County: 6.8 %Washington County6.8Somerset County: 6.7 %Somerset County6.7Cecil County: 6.5 %Cecil County6.5Baltimore County: 6.4 %Baltimore County6.4Allegany County: 6.3 %Allegany County6.3Frederick County: 6.1 %Frederick County6.1Queen Anne's County: 6.1 %Queen Anne's County6.1St. Mary's County: 5.8 %St. Mary's County5.8Anne Arundel County: 5.5 %Anne Arundel County5.5Charles County: 5.2 %Charles County5.2Harford County: 5.1 %Harford County5.1Carroll County: 4.7 %Carroll County4.7Howard County: 4.5 %Howard County4.5Calvert County: 4.4 %Calvert County4.4
%. Source: U.S. Census Bureau, Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Prince George's County10.8-0.4 pts
2Caroline County9.1-0.1 pts
3Wicomico County8.7+0.4 pts
4Dorchester County8.6+1.7 pts
5Kent County8.5+0.2 pts
6Talbot County7.6+0.2 pts
6Worcester County7.60 pts
8Garrett County7.4+0.4 pts
9Montgomery County7.3+0.1 pts
10Baltimore city6.9+0.6 pts
11Washington County6.8+0.5 pts
12Somerset County6.7+0.8 pts
13Cecil County6.5+0.6 pts
14Baltimore County6.4-0.1 pts
15Allegany County6.3+0.8 pts
16Frederick County6.1+1.2 pts
16Queen Anne's County6.1+0.9 pts
18St. Mary's County5.8+0.8 pts
19Anne Arundel County5.5+0.6 pts
20Charles County5.2+0.2 pts
21Harford County5.1+0.9 pts
22Carroll County4.7+0.4 pts
23Howard County4.5+0.6 pts
24Calvert County4.4+0.5 pts

Other periods

About this ranking

People under 65 without health insurance coverage of any kind, as a percentage of all people under 65. 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. People 65 and over are left out because nearly all of them have Medicare.

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, under 65, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-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, under 65, all races, both sexes, all income levels, states and counties (Counties in Maryland by uninsured rate, under 65 (US model-based estimate), 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip

MLA 9

Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties, Counties in Maryland by uninsured rate, under 65 (US model-based estimate), 2021. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/maryland-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. Counties in Maryland by uninsured rate, under 65 (US model-based estimate), 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/maryland-counties?period=2021.

Harvard

U.S. Census Bureau (2026) Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties, Counties in Maryland by uninsured rate, under 65 (US model-based estimate), 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-under-65/maryland-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maryland_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties: Counties in Maryland by uninsured rate, under 65 (US model-based estimate), 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/maryland-counties?period=2021. Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties: Counties in Maryland by uninsured rate, under 65 (US model-based estimate), 2021
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-2021-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-under-65/maryland-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-under-65/maryland-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. Small Area Health Insurance Estimates (SAHIE): percent uninsured, under 65, all races, both sexes, all income levels, states and counties. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2021-csv.zip. Retrieved 2026-10-12.
ER  -
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Questions

Which county has the highest uninsured rate, under 65 (US model-based estimate)?

Prince George's County, with 10.8% in 2021, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, under 65 (US model-based estimate)?

Calvert County, with 4.4% in 2021.

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, under 65, all races, both sexes, all income levels, states and counties. Retrieved 2026-10-12.

Uninsured rate, under 65 (US model-based estimate): other rankings

Counties in Maryland: more rankings