Data / Rankings / Uninsured rate, ages 18 to 64 (US model-based estimate) / Counties in Washington

Counties in Washington by uninsured rate, ages 18 to 64 (US model-based estimate)

Yakima County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 39 counties in 2018, at 21.8%. Garfield County had the lowest, at 5.6%. The median was 10.2% and the figure for Washington was 9.2%. Source: the U.S. Census Bureau.

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Highest21.8Yakima County
Lowest5.6Garfield County
Median10.239 counties
Washington9.2History

Map of counties, 2018

Adams County: 19.5 %Asotin County: 8.6 %Benton County: 11.9 %Chelan County: 14.2 %Clallam County: 11.5 %Clark County: 8.8 %Columbia County: 8.5 %Cowlitz County: 10.1 %Douglas County: 14.9 %Ferry County: 13 %Franklin County: 16.8 %Garfield County: 5.6 %Grant County: 16.9 %Grays Harbor County: 11.7 %Island County: 7.9 %Jefferson County: 10.2 %King County: 7.5 %Kitsap County: 7 %Kittitas County: 9.9 %Klickitat County: 13.5 %Lewis County: 11.1 %Lincoln County: 9.2 %Mason County: 12.4 %Okanogan County: 18.4 %Pacific County: 12.7 %Pend Oreille County: 10.2 %Pierce County: 8.4 %San Juan County: 11 %Skagit County: 11.7 %Skamania County: 9.1 %Snohomish County: 8.7 %Spokane County: 8.1 %Stevens County: 11.9 %Thurston County: 7.9 %Wahkiakum County: 9.4 %Walla Walla County: 10.9 %Whatcom County: 9.4 %Whitman County: 7.2 %Yakima County: 21.8 %
  • Under 8.2
  • 8.2 to 9.2
  • 9.2 to 10
  • 10 to 12
  • 12 to 14
  • 14 and over
%, 2018. 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, 2018

Yakima County: 21.8 %Yakima County21.8Adams County: 19.5 %Adams County19.5Okanogan County: 18.4 %Okanogan County18.4Grant County: 16.9 %Grant County16.9Franklin County: 16.8 %Franklin County16.8Douglas County: 14.9 %Douglas County14.9Chelan County: 14.2 %Chelan County14.2Klickitat County: 13.5 %Klickitat County13.5Ferry County: 13 %Ferry County13Pacific County: 12.7 %Pacific County12.7Mason County: 12.4 %Mason County12.4Benton County: 11.9 %Benton County11.9Stevens County: 11.9 %Stevens County11.9Grays Harbor County: 11.7 %Grays Harbor County11.7Skagit County: 11.7 %Skagit County11.7Clallam County: 11.5 %Clallam County11.5Lewis County: 11.1 %Lewis County11.1San Juan County: 11 %San Juan County11Walla Walla County: 10.9 %Walla Walla County10.9Jefferson County: 10.2 %Jefferson County10.2Pend Oreille County: 10.2 %Pend Oreille County10.2Cowlitz County: 10.1 %Cowlitz County10.1Kittitas County: 9.9 %Kittitas County9.9Wahkiakum County: 9.4 %Wahkiakum County9.4Whatcom County: 9.4 %Whatcom County9.4Lincoln County: 9.2 %Lincoln County9.2Skamania County: 9.1 %Skamania County9.1Clark County: 8.8 %Clark County8.8Snohomish County: 8.7 %Snohomish County8.7Asotin County: 8.6 %Asotin County8.6Columbia County: 8.5 %Columbia County8.5Pierce County: 8.4 %Pierce County8.4Spokane County: 8.1 %Spokane County8.1Island County: 7.9 %Island County7.9Thurston County: 7.9 %Thurston County7.9King County: 7.5 %King County7.5Whitman County: 7.2 %Whitman County7.2Kitsap County: 7 %Kitsap County7Garfield County: 5.6 %Garfield County5.6Yakima County: 21.8 %Yakima County21.8Adams County: 19.5 %Adams County19.5Okanogan County: 18.4 %Okanogan County18.4Grant County: 16.9 %Grant County16.9Franklin County: 16.8 %Franklin County16.8Douglas County: 14.9 %Douglas County14.9Chelan County: 14.2 %Chelan County14.2Klickitat County: 13.5 %Klickitat County13.5Ferry County: 13 %Ferry County13Pacific County: 12.7 %Pacific County12.7Mason County: 12.4 %Mason County12.4Benton County: 11.9 %Benton County11.9Stevens County: 11.9 %Stevens County11.9Grays Harbor County: 11.7 %Grays Harbor County11.7Skagit County: 11.7 %Skagit County11.7Clallam County: 11.5 %Clallam County11.5Lewis County: 11.1 %Lewis County11.1San Juan County: 11 %San Juan County11Walla Walla County: 10.9 %Walla Walla County10.9Jefferson County: 10.2 %Jefferson County10.2Pend Oreille County: 10.2 %Pend Oreille County10.2Cowlitz County: 10.1 %Cowlitz County10.1Kittitas County: 9.9 %Kittitas County9.9Wahkiakum County: 9.4 %Wahkiakum County9.4Whatcom County: 9.4 %Whatcom County9.4Lincoln County: 9.2 %Lincoln County9.2Skamania County: 9.1 %Skamania County9.1Clark County: 8.8 %Clark County8.8Snohomish County: 8.7 %Snohomish County8.7Asotin County: 8.6 %Asotin County8.6Columbia County: 8.5 %Columbia County8.5Pierce County: 8.4 %Pierce County8.4Spokane County: 8.1 %Spokane County8.1Island County: 7.9 %Island County7.9Thurston County: 7.9 %Thurston County7.9King County: 7.5 %King County7.5Whitman County: 7.2 %Whitman County7.2Kitsap County: 7 %Kitsap County7Garfield County: 5.6 %Garfield County5.6
%. 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

RankCounties2018 (%)Change on 2017
1Yakima County21.8+4 pts
2Adams County19.5+1.1 pts
3Okanogan County18.4-0.4 pts
4Grant County16.9-0.3 pts
5Franklin County16.8+0.1 pts
6Douglas County14.90 pts
7Chelan County14.2+2.5 pts
8Klickitat County13.5+1.6 pts
9Ferry County13+0.8 pts
10Pacific County12.7+1.5 pts
11Mason County12.4+1.3 pts
12Benton County11.9+1.9 pts
12Stevens County11.9+2.3 pts
14Grays Harbor County11.7+0.8 pts
14Skagit County11.7+1.1 pts
16Clallam County11.5+0.8 pts
17Lewis County11.1+0.3 pts
18San Juan County11+1.1 pts
19Walla Walla County10.9+1 pts
20Jefferson County10.2+0.8 pts
20Pend Oreille County10.2+0.5 pts
22Cowlitz County10.1+1.8 pts
23Kittitas County9.9+0.3 pts
24Wahkiakum County9.4-0.8 pts
24Whatcom County9.4+0.4 pts
26Lincoln County9.2+1.1 pts
27Skamania County9.1+0.8 pts
28Clark County8.80 pts
29Snohomish County8.7+1.1 pts
30Asotin County8.6+0.7 pts
31Columbia County8.5+0.8 pts
32Pierce County8.4-0.1 pts
33Spokane County8.1+0.7 pts
34Island County7.9+0.8 pts
34Thurston County7.9+0.5 pts
36King County7.5-0.1 pts
37Whitman County7.20 pts
38Kitsap County7+0.7 pts
39Garfield County5.6+0.7 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-2018-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 Washington by uninsured rate, ages 18 to 64 (US model-based estimate), 2018) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-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 Washington by uninsured rate, ages 18 to 64 (US model-based estimate), 2018. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/washington-counties?period=2018. 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 Washington by uninsured rate, ages 18 to 64 (US model-based estimate), 2018. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/washington-counties?period=2018.

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 Washington by uninsured rate, ages 18 to 64 (US model-based estimate), 2018 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/washington-counties?period=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_washington_by_2018,
  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 Washington by uninsured rate, ages 18 to 64 (US model-based estimate), 2018}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2018-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/washington-counties?period=2018. 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-2018-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 Washington by uninsured rate, ages 18 to 64 (US model-based estimate), 2018
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-2018-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/washington-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/washington-counties?period=2018.
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-2018-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)?

Yakima County, with 21.8% in 2018, according to the U.S. Census Bureau.

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

Garfield County, with 5.6% in 2018.

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 Washington: more rankings