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 2015, at 13.7%. Harford County had the lowest, at 5%. The median was 8.2% and the figure for Maryland was 8.8%. Source: the U.S. Census Bureau.

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Highest13.7Prince George's County
Lowest5Harford County
Median8.224 counties
Maryland8.8History

Map of counties, 2015

Allegany County: 7.5 %Anne Arundel County: 6.6 %Baltimore County: 8.1 %Calvert County: 5.3 %Caroline County: 10.2 %Carroll County: 5 %Cecil County: 7.2 %Charles County: 5.6 %Dorchester County: 10.2 %Frederick County: 6.5 %Garrett County: 8.4 %Harford County: 5 %Howard County: 5.2 %Kent County: 10.2 %Montgomery County: 10.1 %Prince George's County: 13.7 %Queen Anne's County: 6.5 %St. Mary's County: 5.9 %Somerset County: 11.2 %Talbot County: 9.3 %Washington County: 8.3 %Wicomico County: 9.5 %Worcester County: 8.7 %Baltimore city: 9.8 %
  • Under 5.8
  • 5.8 to 7.3
  • 7.3 to 8.6
  • 8.6 to 10
  • 10 and over
%, 2015. 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, 2015

Prince George's County: 13.7 %Prince George's County13.7Somerset County: 11.2 %Somerset County11.2Caroline County: 10.2 %Caroline County10.2Dorchester County: 10.2 %Dorchester County10.2Kent County: 10.2 %Kent County10.2Montgomery County: 10.1 %Montgomery County10.1Baltimore city: 9.8 %Baltimore city9.8Wicomico County: 9.5 %Wicomico County9.5Talbot County: 9.3 %Talbot County9.3Worcester County: 8.7 %Worcester County8.7Garrett County: 8.4 %Garrett County8.4Washington County: 8.3 %Washington County8.3Baltimore County: 8.1 %Baltimore County8.1Allegany County: 7.5 %Allegany County7.5Cecil County: 7.2 %Cecil County7.2Anne Arundel County: 6.6 %Anne Arundel County6.6Frederick County: 6.5 %Frederick County6.5Queen Anne's County: 6.5 %Queen Anne's County6.5St. Mary's County: 5.9 %St. Mary's County5.9Charles County: 5.6 %Charles County5.6Calvert County: 5.3 %Calvert County5.3Howard County: 5.2 %Howard County5.2Carroll County: 5 %Carroll County5Harford County: 5 %Harford County5Prince George's County: 13.7 %Prince George's County13.7Somerset County: 11.2 %Somerset County11.2Caroline County: 10.2 %Caroline County10.2Dorchester County: 10.2 %Dorchester County10.2Kent County: 10.2 %Kent County10.2Montgomery County: 10.1 %Montgomery County10.1Baltimore city: 9.8 %Baltimore city9.8Wicomico County: 9.5 %Wicomico County9.5Talbot County: 9.3 %Talbot County9.3Worcester County: 8.7 %Worcester County8.7Garrett County: 8.4 %Garrett County8.4Washington County: 8.3 %Washington County8.3Baltimore County: 8.1 %Baltimore County8.1Allegany County: 7.5 %Allegany County7.5Cecil County: 7.2 %Cecil County7.2Anne Arundel County: 6.6 %Anne Arundel County6.6Frederick County: 6.5 %Frederick County6.5Queen Anne's County: 6.5 %Queen Anne's County6.5St. Mary's County: 5.9 %St. Mary's County5.9Charles County: 5.6 %Charles County5.6Calvert County: 5.3 %Calvert County5.3Howard County: 5.2 %Howard County5.2Carroll County: 5 %Carroll County5Harford County: 5 %Harford 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

RankCounties2015 (%)Change on 2014
1Prince George's County13.7-3.1 pts
2Somerset County11.2-1.8 pts
3Caroline County10.2-2.8 pts
3Dorchester County10.2-1.8 pts
3Kent County10.2-1.8 pts
6Montgomery County10.1-2.5 pts
7Baltimore city9.8-2.2 pts
8Wicomico County9.5-3.7 pts
9Talbot County9.3-2 pts
10Worcester County8.7-3.2 pts
11Garrett County8.4-2.6 pts
12Washington County8.3-1.7 pts
13Baltimore County8.1-2.1 pts
14Allegany County7.5-1.6 pts
15Cecil County7.2-1.6 pts
16Anne Arundel County6.6-1.4 pts
17Frederick County6.5-1.6 pts
17Queen Anne's County6.5-1.5 pts
19St. Mary's County5.9-1.9 pts
20Charles County5.6-1.7 pts
21Calvert County5.3-1.5 pts
22Howard County5.2-1.1 pts
23Carroll County5-1.5 pts
23Harford County5-1.9 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-2015-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), 2015) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2015-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), 2015. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2015-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2015. 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), 2015. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2015-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2015.

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), 2015 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2015-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2015 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maryland_by_2015,
  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), 2015}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2015-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2015. 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-2015-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), 2015
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-2015-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2015.
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-2015-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 13.7% in 2015, according to the U.S. Census Bureau.

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

Harford County, with 5% in 2015.

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