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 2019, at 12.5%. Carroll County had the lowest, at 5%. The median was 8.1% and the figure for Maryland was 8.3%. Source: the U.S. Census Bureau.

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Highest12.5Prince George's County
Lowest5Carroll County
Median8.124 counties
Maryland8.3History

Map of counties, 2019

Allegany County: 6.8 %Anne Arundel County: 5.8 %Baltimore County: 8.2 %Calvert County: 5 %Caroline County: 10.3 %Carroll County: 5 %Cecil County: 6.8 %Charles County: 5.4 %Dorchester County: 8.4 %Frederick County: 6.6 %Garrett County: 8.8 %Harford County: 5.4 %Howard County: 5.2 %Kent County: 9.3 %Montgomery County: 9.9 %Prince George's County: 12.5 %Queen Anne's County: 6.6 %St. Mary's County: 6.1 %Somerset County: 9.1 %Talbot County: 9.1 %Washington County: 8 %Wicomico County: 10.3 %Worcester County: 8.6 %Baltimore city: 8.3 %
  • Under 5.6
  • 5.6 to 6.8
  • 6.8 to 8.4
  • 8.4 to 9.2
  • 9.2 and over
%, 2019. 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, 2019

Prince George's County: 12.5 %Prince George's County12.5Caroline County: 10.3 %Caroline County10.3Wicomico County: 10.3 %Wicomico County10.3Montgomery County: 9.9 %Montgomery County9.9Kent County: 9.3 %Kent County9.3Somerset County: 9.1 %Somerset County9.1Talbot County: 9.1 %Talbot County9.1Garrett County: 8.8 %Garrett County8.8Worcester County: 8.6 %Worcester County8.6Dorchester County: 8.4 %Dorchester County8.4Baltimore city: 8.3 %Baltimore city8.3Baltimore County: 8.2 %Baltimore County8.2Washington County: 8 %Washington County8Allegany County: 6.8 %Allegany County6.8Cecil County: 6.8 %Cecil County6.8Frederick County: 6.6 %Frederick County6.6Queen Anne's County: 6.6 %Queen Anne's County6.6St. Mary's County: 6.1 %St. Mary's County6.1Anne Arundel County: 5.8 %Anne Arundel County5.8Charles County: 5.4 %Charles County5.4Harford County: 5.4 %Harford County5.4Howard County: 5.2 %Howard County5.2Calvert County: 5 %Calvert County5Carroll County: 5 %Carroll County5Prince George's County: 12.5 %Prince George's County12.5Caroline County: 10.3 %Caroline County10.3Wicomico County: 10.3 %Wicomico County10.3Montgomery County: 9.9 %Montgomery County9.9Kent County: 9.3 %Kent County9.3Somerset County: 9.1 %Somerset County9.1Talbot County: 9.1 %Talbot County9.1Garrett County: 8.8 %Garrett County8.8Worcester County: 8.6 %Worcester County8.6Dorchester County: 8.4 %Dorchester County8.4Baltimore city: 8.3 %Baltimore city8.3Baltimore County: 8.2 %Baltimore County8.2Washington County: 8 %Washington County8Allegany County: 6.8 %Allegany County6.8Cecil County: 6.8 %Cecil County6.8Frederick County: 6.6 %Frederick County6.6Queen Anne's County: 6.6 %Queen Anne's County6.6St. Mary's County: 6.1 %St. Mary's County6.1Anne Arundel County: 5.8 %Anne Arundel County5.8Charles County: 5.4 %Charles County5.4Harford County: 5.4 %Harford County5.4Howard County: 5.2 %Howard County5.2Calvert County: 5 %Calvert County5Carroll County: 5 %Carroll County5
%. 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

RankCounties2019 (%)Change on 2018
1Prince George's County12.5-1 pts
2Caroline County10.3+0.5 pts
2Wicomico County10.3+0.8 pts
4Montgomery County9.9+0.3 pts
5Kent County9.3+0.3 pts
6Somerset County9.1+0.2 pts
6Talbot County9.1+0.5 pts
8Garrett County8.8+0.8 pts
9Worcester County8.6+0.5 pts
10Dorchester County8.4-0.3 pts
11Baltimore city8.3-0.6 pts
12Baltimore County8.2+0.9 pts
13Washington County8+0.6 pts
14Allegany County6.8+0.4 pts
14Cecil County6.8+0.6 pts
16Frederick County6.60 pts
16Queen Anne's County6.6+0.5 pts
18St. Mary's County6.1-0.2 pts
19Anne Arundel County5.80 pts
20Charles County5.4-0.1 pts
20Harford County5.4-0.1 pts
22Howard County5.2+0.2 pts
23Calvert County5+0.6 pts
23Carroll County50 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-2019-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), 2019) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2019-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), 2019. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2019-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2019. 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), 2019. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2019-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2019.

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), 2019 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2019-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maryland_by_2019,
  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), 2019}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2019-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2019. 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-2019-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), 2019
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-2019-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2019.
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-2019-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 12.5% in 2019, according to the U.S. Census Bureau.

Which county has the lowest uninsured rate, ages 18 to 64 (US model-based estimate)?

Carroll County, with 5% in 2019.

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