Data / Rankings / Uninsured rate, all ages (US) / Counties in Maryland

Counties in Maryland by uninsured rate, all ages (US)

Prince George's County had the highest uninsured rate, all ages (US) of 24 counties in 2021, at 10.3%. Calvert County had the lowest, at 2.9%. The median was 4.5% and the figure for Maryland was 6%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest10.3Prince George's County
Lowest2.9Calvert County
Median4.524 counties
Maryland6History

Map of counties, 2021

Allegany County: 4.2 %Anne Arundel County: 4.5 %Baltimore County: 5.2 %Calvert County: 2.9 %Caroline County: 6.7 %Carroll County: 3.1 %Cecil County: 4.1 %Charles County: 4.5 %Dorchester County: 5.4 %Frederick County: 4.6 %Garrett County: 5.5 %Harford County: 3.5 %Howard County: 3.9 %Kent County: 4 %Montgomery County: 6.7 %Prince George's County: 10.3 %Queen Anne's County: 4.5 %St. Mary's County: 4.3 %Somerset County: 5 %Talbot County: 4.3 %Washington County: 4.9 %Wicomico County: 6.7 %Worcester County: 6.3 %Baltimore city: 5.9 %
  • Under 4
  • 4 to 4.5
  • 4.5 to 5
  • 5 to 6.1
  • 6.1 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: 10.3 %Prince George's County10.3Wicomico County: 6.7 %Wicomico County6.7Caroline County: 6.7 %Caroline County6.7Montgomery County: 6.7 %Montgomery County6.7Worcester County: 6.3 %Worcester County6.3Baltimore city: 5.9 %Baltimore city5.9Garrett County: 5.5 %Garrett County5.5Dorchester County: 5.4 %Dorchester County5.4Baltimore County: 5.2 %Baltimore County5.2Somerset County: 5 %Somerset County5Washington County: 4.9 %Washington County4.9Frederick County: 4.6 %Frederick County4.6Queen Anne's County: 4.5 %Queen Anne's County4.5Anne Arundel County: 4.5 %Anne Arundel County4.5Charles County: 4.5 %Charles County4.5Talbot County: 4.3 %Talbot County4.3St. Mary's County: 4.3 %St. Mary's County4.3Allegany County: 4.2 %Allegany County4.2Cecil County: 4.1 %Cecil County4.1Kent County: 4 %Kent County4Howard County: 3.9 %Howard County3.9Harford County: 3.5 %Harford County3.5Carroll County: 3.1 %Carroll County3.1Calvert County: 2.9 %Calvert County2.9Prince George's County: 10.3 %Prince George's County10.3Wicomico County: 6.7 %Wicomico County6.7Caroline County: 6.7 %Caroline County6.7Montgomery County: 6.7 %Montgomery County6.7Worcester County: 6.3 %Worcester County6.3Baltimore city: 5.9 %Baltimore city5.9Garrett County: 5.5 %Garrett County5.5Dorchester County: 5.4 %Dorchester County5.4Baltimore County: 5.2 %Baltimore County5.2Somerset County: 5 %Somerset County5Washington County: 4.9 %Washington County4.9Frederick County: 4.6 %Frederick County4.6Queen Anne's County: 4.5 %Queen Anne's County4.5Anne Arundel County: 4.5 %Anne Arundel County4.5Charles County: 4.5 %Charles County4.5Talbot County: 4.3 %Talbot County4.3St. Mary's County: 4.3 %St. Mary's County4.3Allegany County: 4.2 %Allegany County4.2Cecil County: 4.1 %Cecil County4.1Kent County: 4 %Kent County4Howard County: 3.9 %Howard County3.9Harford County: 3.5 %Harford County3.5Carroll County: 3.1 %Carroll County3.1Calvert County: 2.9 %Calvert County2.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)
1Prince George's County10.3
2Wicomico County6.7
3Caroline County6.7
3Montgomery County6.7
5Worcester County6.3
6Baltimore city5.9
7Garrett County5.5
8Dorchester County5.4
9Baltimore County5.2
10Somerset County5
11Washington County4.9
12Frederick County4.6
13Queen Anne's County4.5
14Anne Arundel County4.5
15Charles County4.5
16Talbot County4.3
17St. Mary's County4.3
18Allegany County4.2
19Cecil County4.1
20Kent County4
21Howard County3.9
22Harford County3.5
23Carroll County3.1
24Calvert County2.9

Other periods

About this ranking

People without health insurance coverage of any kind, as a percentage of the civilian noninstitutionalized population. 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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, 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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs (Counties in Maryland by uninsured rate, all ages (US), 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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs, Counties in Maryland by uninsured rate, all ages (US), 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/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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs. Counties in Maryland by uninsured rate, all ages (US), 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/maryland-counties?period=2021.

Harvard

U.S. Census Bureau (2026) American Community Survey 5-year estimates, table B27010: people with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs, Counties in Maryland by uninsured rate, all ages (US), 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/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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs: Counties in Maryland by uninsured rate, all ages (US), 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/maryland-counties?period=2021. Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B27010: people with no health insurance coverage as a percentage of the civilian noninstitutionalized population, 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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs: Counties in Maryland by uninsured rate, all ages (US), 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/maryland-counties?period=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate/maryland-counties?period=2021.
N1  - Publisher attribution: U.S. Census Bureau. American Community Survey 5-year estimates, table B27010: people with no health insurance coverage as a percentage of the civilian noninstitutionalized population, 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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Questions

Which county has the highest uninsured rate, all ages (US)?

Prince George's County, with 10.3% in 2021, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, all ages (US)?

Calvert County, with 2.9% 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 with no health insurance coverage as a percentage of the civilian noninstitutionalized population, calculated with stored inputs. Retrieved 2026-10-12.

Uninsured rate, all ages (US): other rankings

Counties in Maryland: more rankings