Data / Rankings / Uninsured rate, ages 35 to 64 (US, ACS) / Counties in Maryland

Counties in Maryland by uninsured rate, ages 35 to 64 (US, ACS)

Prince George's County had the highest uninsured rate, ages 35 to 64 (US, ACS) of 24 counties in 2021, at 12.2%. Calvert County had the lowest, at 3.3%. The median was 5.8% and the figure for Maryland was 7.1%. Source: the U.S. Census Bureau.

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Highest12.2Prince George's County
Lowest3.3Calvert County
Median5.824 counties
Maryland7.1History

Map of counties, 2021

Allegany County: 5 %Anne Arundel County: 4.9 %Baltimore County: 6 %Calvert County: 3.3 %Caroline County: 7.3 %Carroll County: 3.9 %Cecil County: 4.7 %Charles County: 3.9 %Dorchester County: 6.2 %Frederick County: 5.9 %Garrett County: 7.3 %Harford County: 3.6 %Howard County: 4.2 %Kent County: 4.4 %Montgomery County: 8.3 %Prince George's County: 12.2 %Queen Anne's County: 5.8 %St. Mary's County: 4.5 %Somerset County: 5.5 %Talbot County: 6 %Washington County: 6.1 %Wicomico County: 7.5 %Worcester County: 8.2 %Baltimore city: 7.7 %
  • Under 4.3
  • 4.3 to 5.1
  • 5.1 to 6
  • 6 to 7.4
  • 7.4 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2021

Prince George's County: 12.2 %Prince George's County12.2Montgomery County: 8.3 %Montgomery County8.3Worcester County: 8.2 %Worcester County8.2Baltimore city: 7.7 %Baltimore city7.7Wicomico County: 7.5 %Wicomico County7.5Garrett County: 7.3 %Garrett County7.3Caroline County: 7.3 %Caroline County7.3Dorchester County: 6.2 %Dorchester County6.2Washington County: 6.1 %Washington County6.1Baltimore County: 6 %Baltimore County6Talbot County: 6 %Talbot County6Frederick County: 5.9 %Frederick County5.9Queen Anne's County: 5.8 %Queen Anne's County5.8Somerset County: 5.5 %Somerset County5.5Allegany County: 5 %Allegany County5Anne Arundel County: 4.9 %Anne Arundel County4.9Cecil County: 4.7 %Cecil County4.7St. Mary's County: 4.5 %St. Mary's County4.5Kent County: 4.4 %Kent County4.4Howard County: 4.2 %Howard County4.2Carroll County: 3.9 %Carroll County3.9Charles County: 3.9 %Charles County3.9Harford County: 3.6 %Harford County3.6Calvert County: 3.3 %Calvert County3.3Prince George's County: 12.2 %Prince George's County12.2Montgomery County: 8.3 %Montgomery County8.3Worcester County: 8.2 %Worcester County8.2Baltimore city: 7.7 %Baltimore city7.7Wicomico County: 7.5 %Wicomico County7.5Garrett County: 7.3 %Garrett County7.3Caroline County: 7.3 %Caroline County7.3Dorchester County: 6.2 %Dorchester County6.2Washington County: 6.1 %Washington County6.1Baltimore County: 6 %Baltimore County6Talbot County: 6 %Talbot County6Frederick County: 5.9 %Frederick County5.9Queen Anne's County: 5.8 %Queen Anne's County5.8Somerset County: 5.5 %Somerset County5.5Allegany County: 5 %Allegany County5Anne Arundel County: 4.9 %Anne Arundel County4.9Cecil County: 4.7 %Cecil County4.7St. Mary's County: 4.5 %St. Mary's County4.5Kent County: 4.4 %Kent County4.4Howard County: 4.2 %Howard County4.2Carroll County: 3.9 %Carroll County3.9Charles County: 3.9 %Charles County3.9Harford County: 3.6 %Harford County3.6Calvert County: 3.3 %Calvert County3.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Prince George's County12.2
2Montgomery County8.3
3Worcester County8.2
4Baltimore city7.7
5Wicomico County7.5
6Garrett County7.3
7Caroline County7.3
8Dorchester County6.2
9Washington County6.1
10Baltimore County6
10Talbot County6
12Frederick County5.9
13Queen Anne's County5.8
14Somerset County5.5
15Allegany County5
16Anne Arundel County4.9
17Cecil County4.7
18St. Mary's County4.5
19Kent County4.4
20Howard County4.2
21Carroll County3.9
22Charles County3.9
23Harford County3.6
24Calvert County3.3

Other periods

About this ranking

People aged 35 to 64 without health insurance coverage of any kind, as a percentage of the civilian noninstitutionalized population aged 35 to 64. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

Coverage is what people reported at the interview, so the five-year figure averages five years of answers. People whose only coverage is the Indian Health Service count as uninsured. Active-duty military and people living in institutions are outside the universe. For single-year model-based county figures under 65, see uninsured_rate_under_65, uninsured_rate_18_64 and uninsured_rate_under_19 (SAHIE), a different source.

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. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. 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). American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs (Counties in Maryland by uninsured rate, ages 35 to 64 (US, ACS), 2021) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat

MLA 9

American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs, Counties in Maryland by uninsured rate, ages 35 to 64 (US, ACS), 2021. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/maryland-counties?period=2021. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. Counties in Maryland by uninsured rate, ages 35 to 64 (US, ACS), 2021. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/maryland-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs, Counties in Maryland by uninsured rate, ages 35 to 64 (US, ACS), 2021 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-35-64/maryland-counties?period=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maryland_by_2021,
  author = {{U.S. Census Bureau}},
  title = {{American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs: Counties in Maryland by uninsured rate, ages 35 to 64 (US, ACS), 2021}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/maryland-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary\_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs: Counties in Maryland by uninsured rate, ages 35 to 64 (US, ACS), 2021
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat
L2  - https://invokely.ai/rankings/uninsured-rate-ages-35-64/maryland-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-35-64/maryland-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. https://www2.census.gov/programs-surveys/acs/summary_file/2021/table-based-SF/data/5YRData/acsdt5y2021-b27010.dat. Retrieved 2026-10-12.
ER  -
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Rank Counties in Maryland by uninsured rate, ages 35 to 64 (US, ACS) using official data, and cite the source.
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Questions

Which county has the highest uninsured rate, ages 35 to 64 (US, ACS)?

Prince George's County, with 12.2% in 2021, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, ages 35 to 64 (US, ACS)?

Calvert County, with 3.3% 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, American Community Survey 5-year estimates, table B27010: people aged 35 to 64 with no health insurance coverage as a percentage of the civilian noninstitutionalized population aged 35 to 64, calculated with stored inputs. Retrieved 2026-10-12.

Uninsured rate, ages 35 to 64 (US, ACS): other rankings

Counties in Maryland: more rankings