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 2023, at 11.2%. Carroll County had the lowest, at 2.8%. The median was 5% and the figure for Maryland was 6.2%. Source: the U.S. Census Bureau.

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Highest11.2Prince George's County
Lowest2.8Carroll County
Median524 counties
Maryland6.2History

Map of counties, 2023

Allegany County: 4.1 %Anne Arundel County: 4.6 %Baltimore County: 5.5 %Calvert County: 3.3 %Caroline County: 7.1 %Carroll County: 2.8 %Cecil County: 3.8 %Charles County: 4.4 %Dorchester County: 5.4 %Frederick County: 4.6 %Garrett County: 6 %Harford County: 3.7 %Howard County: 4 %Kent County: 5.3 %Montgomery County: 6.8 %Prince George's County: 11.2 %Queen Anne's County: 5.7 %St. Mary's County: 3.7 %Somerset County: 3.4 %Talbot County: 4.5 %Washington County: 6.1 %Wicomico County: 6.5 %Worcester County: 5.5 %Baltimore city: 5.8 %
  • Under 3.8
  • 3.8 to 4.5
  • 4.5 to 5.5
  • 5.5 to 6
  • 6 and over
%, 2023. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2023

Prince George's County: 11.2 %Prince George's County11.2Caroline County: 7.1 %Caroline County7.1Montgomery County: 6.8 %Montgomery County6.8Wicomico County: 6.5 %Wicomico County6.5Washington County: 6.1 %Washington County6.1Garrett County: 6 %Garrett County6Baltimore city: 5.8 %Baltimore city5.8Queen Anne's County: 5.7 %Queen Anne's County5.7Baltimore County: 5.5 %Baltimore County5.5Worcester County: 5.5 %Worcester County5.5Dorchester County: 5.4 %Dorchester County5.4Kent County: 5.3 %Kent County5.3Anne Arundel County: 4.6 %Anne Arundel County4.6Frederick County: 4.6 %Frederick County4.6Talbot County: 4.5 %Talbot County4.5Charles County: 4.4 %Charles County4.4Allegany County: 4.1 %Allegany County4.1Howard County: 4 %Howard County4Cecil County: 3.8 %Cecil County3.8St. Mary's County: 3.7 %St. Mary's County3.7Harford County: 3.7 %Harford County3.7Somerset County: 3.4 %Somerset County3.4Calvert County: 3.3 %Calvert County3.3Carroll County: 2.8 %Carroll County2.8Prince George's County: 11.2 %Prince George's County11.2Caroline County: 7.1 %Caroline County7.1Montgomery County: 6.8 %Montgomery County6.8Wicomico County: 6.5 %Wicomico County6.5Washington County: 6.1 %Washington County6.1Garrett County: 6 %Garrett County6Baltimore city: 5.8 %Baltimore city5.8Queen Anne's County: 5.7 %Queen Anne's County5.7Baltimore County: 5.5 %Baltimore County5.5Worcester County: 5.5 %Worcester County5.5Dorchester County: 5.4 %Dorchester County5.4Kent County: 5.3 %Kent County5.3Anne Arundel County: 4.6 %Anne Arundel County4.6Frederick County: 4.6 %Frederick County4.6Talbot County: 4.5 %Talbot County4.5Charles County: 4.4 %Charles County4.4Allegany County: 4.1 %Allegany County4.1Howard County: 4 %Howard County4Cecil County: 3.8 %Cecil County3.8St. Mary's County: 3.7 %St. Mary's County3.7Harford County: 3.7 %Harford County3.7Somerset County: 3.4 %Somerset County3.4Calvert County: 3.3 %Calvert County3.3Carroll County: 2.8 %Carroll County2.8
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Prince George's County11.2+0.7 pts
2Caroline County7.1+0.3 pts
3Montgomery County6.8+0.1 pts
4Wicomico County6.50 pts
5Washington County6.1+0.6 pts
6Garrett County6+0.2 pts
7Baltimore city5.8+0.3 pts
8Queen Anne's County5.7+0.6 pts
9Baltimore County5.5+0.1 pts
9Worcester County5.5-0.3 pts
11Dorchester County5.4+0.2 pts
12Kent County5.3+1.1 pts
13Anne Arundel County4.6+0.1 pts
14Frederick County4.6+0.1 pts
15Talbot County4.5+0.2 pts
16Charles County4.4+0.4 pts
17Allegany County4.1+0.1 pts
18Howard County4+0.1 pts
19Cecil County3.8-0.1 pts
20St. Mary's County3.7-0.2 pts
21Harford County3.7+0.2 pts
22Somerset County3.4-0.5 pts
23Calvert County3.3+0.2 pts
24Carroll County2.8-0.1 pts

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/2023/table-based-SF/data/5YRData/acsdt5y2023-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), 2023) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-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), 2023. U.S. Census Bureau, 29 Jan. 2026, https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b27010.dat. Invokely, https://invokely.ai/rankings/uninsured-rate/maryland-counties?period=2023. 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), 2023. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b27010.dat. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate/maryland-counties?period=2023.

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), 2023 [Dataset]. Available at: https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b27010.dat, via Invokely: https://invokely.ai/rankings/uninsured-rate/maryland-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maryland_by_2023,
  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), 2023}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b27010.dat},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate/maryland-counties?period=2023. 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/2023/table-based-SF/data/5YRData/acsdt5y2023-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), 2023
PY  - 2026
DA  - 2026/01/29
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b27010.dat
L2  - https://invokely.ai/rankings/uninsured-rate/maryland-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate/maryland-counties?period=2023.
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/2023/table-based-SF/data/5YRData/acsdt5y2023-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 11.2% in 2023, according to the U.S. Census Bureau.

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

Carroll County, with 2.8% in 2023.

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