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 2016, at 13%. Calvert County had the lowest, at 4.8%. The median was 8.1% and the figure for Maryland was 8.4%. Source: the U.S. Census Bureau.

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Highest13Prince George's County
Lowest4.8Calvert County
Median8.124 counties
Maryland8.4History

Map of counties, 2016

Allegany County: 7.5 %Anne Arundel County: 6.2 %Baltimore County: 7.6 %Calvert County: 4.8 %Caroline County: 10.4 %Carroll County: 5.1 %Cecil County: 8.1 %Charles County: 5.8 %Dorchester County: 9.2 %Frederick County: 6.3 %Garrett County: 8.2 %Harford County: 5.7 %Howard County: 5.1 %Kent County: 9.2 %Montgomery County: 9.1 %Prince George's County: 13 %Queen Anne's County: 6.5 %St. Mary's County: 6.3 %Somerset County: 10.9 %Talbot County: 9 %Washington County: 8.4 %Wicomico County: 9.8 %Worcester County: 8.3 %Baltimore city: 9.1 %
  • Under 6
  • 6 to 7.5
  • 7.5 to 8.4
  • 8.4 to 9.2
  • 9.2 and over
%, 2016. 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, 2016

Prince George's County: 13 %Prince George's County13Somerset County: 10.9 %Somerset County10.9Caroline County: 10.4 %Caroline County10.4Wicomico County: 9.8 %Wicomico County9.8Dorchester County: 9.2 %Dorchester County9.2Kent County: 9.2 %Kent County9.2Baltimore city: 9.1 %Baltimore city9.1Montgomery County: 9.1 %Montgomery County9.1Talbot County: 9 %Talbot County9Washington County: 8.4 %Washington County8.4Worcester County: 8.3 %Worcester County8.3Garrett County: 8.2 %Garrett County8.2Cecil County: 8.1 %Cecil County8.1Baltimore County: 7.6 %Baltimore County7.6Allegany County: 7.5 %Allegany County7.5Queen Anne's County: 6.5 %Queen Anne's County6.5Frederick County: 6.3 %Frederick County6.3St. Mary's County: 6.3 %St. Mary's County6.3Anne Arundel County: 6.2 %Anne Arundel County6.2Charles County: 5.8 %Charles County5.8Harford County: 5.7 %Harford County5.7Carroll County: 5.1 %Carroll County5.1Howard County: 5.1 %Howard County5.1Calvert County: 4.8 %Calvert County4.8Prince George's County: 13 %Prince George's County13Somerset County: 10.9 %Somerset County10.9Caroline County: 10.4 %Caroline County10.4Wicomico County: 9.8 %Wicomico County9.8Dorchester County: 9.2 %Dorchester County9.2Kent County: 9.2 %Kent County9.2Baltimore city: 9.1 %Baltimore city9.1Montgomery County: 9.1 %Montgomery County9.1Talbot County: 9 %Talbot County9Washington County: 8.4 %Washington County8.4Worcester County: 8.3 %Worcester County8.3Garrett County: 8.2 %Garrett County8.2Cecil County: 8.1 %Cecil County8.1Baltimore County: 7.6 %Baltimore County7.6Allegany County: 7.5 %Allegany County7.5Queen Anne's County: 6.5 %Queen Anne's County6.5Frederick County: 6.3 %Frederick County6.3St. Mary's County: 6.3 %St. Mary's County6.3Anne Arundel County: 6.2 %Anne Arundel County6.2Charles County: 5.8 %Charles County5.8Harford County: 5.7 %Harford County5.7Carroll County: 5.1 %Carroll County5.1Howard County: 5.1 %Howard County5.1Calvert County: 4.8 %Calvert County4.8
%. 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

RankCounties2016 (%)Change on 2015
1Prince George's County13-0.7 pts
2Somerset County10.9-0.3 pts
3Caroline County10.4+0.2 pts
4Wicomico County9.8+0.3 pts
5Dorchester County9.2-1 pts
5Kent County9.2-1 pts
7Baltimore city9.1-0.7 pts
7Montgomery County9.1-1 pts
9Talbot County9-0.3 pts
10Washington County8.4+0.1 pts
11Worcester County8.3-0.4 pts
12Garrett County8.2-0.2 pts
13Cecil County8.1+0.9 pts
14Baltimore County7.6-0.5 pts
15Allegany County7.50 pts
16Queen Anne's County6.50 pts
17Frederick County6.3-0.2 pts
17St. Mary's County6.3+0.4 pts
19Anne Arundel County6.2-0.4 pts
20Charles County5.8+0.2 pts
21Harford County5.7+0.7 pts
22Carroll County5.1+0.1 pts
22Howard County5.1-0.1 pts
24Calvert County4.8-0.5 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-2016-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), 2016) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2016-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), 2016. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2016-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2016. 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), 2016. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2016-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2016.

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), 2016 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2016-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2016 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_maryland_by_2016,
  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), 2016}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2016-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2016. 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-2016-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), 2016
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-2016-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/maryland-counties?period=2016.
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-2016-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% in 2016, according to the U.S. Census Bureau.

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

Calvert County, with 4.8% in 2016.

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