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

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

Lake County had the highest uninsured rate, ages 18 to 64 (US model-based estimate) of 64 counties in 2020, at 23.5%. Gilpin County had the lowest, at 5%. The median was 13.8% and the figure for Colorado was 11.5%. Source: the U.S. Census Bureau.

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Highest23.5Lake County
Lowest5Gilpin County
Median13.864 counties
Colorado11.5History

Map of counties, 2020

Adams County: 15 %Alamosa County: 17.6 %Arapahoe County: 12 %Archuleta County: 17.4 %Baca County: 13.5 %Bent County: 10.4 %Boulder County: 8 %Broomfield County: 6.8 %Chaffee County: 13.7 %Cheyenne County: 13.8 %Clear Creek County: 8.9 %Conejos County: 13.9 %Costilla County: 17.1 %Crowley County: 9.8 %Custer County: 12.3 %Delta County: 15.6 %Denver County: 13.7 %Dolores County: 11.5 %Douglas County: 5.4 %Eagle County: 18.2 %Elbert County: 9 %El Paso County: 10.3 %Fremont County: 11 %Garfield County: 21.5 %Gilpin County: 5 %Grand County: 15.1 %Gunnison County: 13 %Hinsdale County: 17.5 %Huerfano County: 8.9 %Jackson County: 20.4 %Jefferson County: 7.9 %Kiowa County: 8.8 %Kit Carson County: 18.3 %Lake County: 23.5 %La Plata County: 13.7 %Larimer County: 9.1 %Las Animas County: 15.3 %Lincoln County: 11.4 %Logan County: 14.3 %Mesa County: 14.3 %Mineral County: 13.4 %Moffat County: 15.8 %Montezuma County: 17.6 %Montrose County: 16.7 %Morgan County: 19.5 %Otero County: 15.1 %Ouray County: 11.6 %Park County: 9.9 %Phillips County: 18.2 %Pitkin County: 10 %Prowers County: 19 %Pueblo County: 11.3 %Rio Blanco County: 12.1 %Rio Grande County: 17.6 %Routt County: 12.1 %Saguache County: 18.1 %San Juan County: 18 %San Miguel County: 14.3 %Sedgwick County: 14.9 %Summit County: 16.6 %Teller County: 9.3 %Washington County: 11.1 %Weld County: 14.2 %Yuma County: 20.4 %
  • Under 9.6
  • 9.6 to 12
  • 12 to 14
  • 14 to 15
  • 15 to 18
  • 18 and over
%, 2020. 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.

Top 40 counties, 2020

Lake County: 23.5 %Lake County23.5Garfield County: 21.5 %Garfield County21.5Jackson County: 20.4 %Jackson County20.4Yuma County: 20.4 %Yuma County20.4Morgan County: 19.5 %Morgan County19.5Prowers County: 19 %Prowers County19Kit Carson County: 18.3 %Kit Carson County18.3Eagle County: 18.2 %Eagle County18.2Phillips County: 18.2 %Phillips County18.2Saguache County: 18.1 %Saguache County18.1San Juan County: 18 %San Juan County18Alamosa County: 17.6 %Alamosa County17.6Montezuma County: 17.6 %Montezuma County17.6Rio Grande County: 17.6 %Rio Grande County17.6Hinsdale County: 17.5 %Hinsdale County17.5Archuleta County: 17.4 %Archuleta County17.4Costilla County: 17.1 %Costilla County17.1Montrose County: 16.7 %Montrose County16.7Summit County: 16.6 %Summit County16.6Moffat County: 15.8 %Moffat County15.8Delta County: 15.6 %Delta County15.6Las Animas County: 15.3 %Las Animas County15.3Grand County: 15.1 %Grand County15.1Otero County: 15.1 %Otero County15.1Adams County: 15 %Adams County15Sedgwick County: 14.9 %Sedgwick County14.9Logan County: 14.3 %Logan County14.3Mesa County: 14.3 %Mesa County14.3San Miguel County: 14.3 %San Miguel County14.3Weld County: 14.2 %Weld County14.2Conejos County: 13.9 %Conejos County13.9Cheyenne County: 13.8 %Cheyenne County13.8Chaffee County: 13.7 %Chaffee County13.7Denver County: 13.7 %Denver County13.7La Plata County: 13.7 %La Plata County13.7Baca County: 13.5 %Baca County13.5Mineral County: 13.4 %Mineral County13.4Gunnison County: 13 %Gunnison County13Custer County: 12.3 %Custer County12.3Rio Blanco County: 12.1 %Rio Blanco County12.1Lake County: 23.5 %Lake County23.5Garfield County: 21.5 %Garfield County21.5Jackson County: 20.4 %Jackson County20.4Yuma County: 20.4 %Yuma County20.4Morgan County: 19.5 %Morgan County19.5Prowers County: 19 %Prowers County19Kit Carson County: 18.3 %Kit Carson County18.3Eagle County: 18.2 %Eagle County18.2Phillips County: 18.2 %Phillips County18.2Saguache County: 18.1 %Saguache County18.1San Juan County: 18 %San Juan County18Alamosa County: 17.6 %Alamosa County17.6Montezuma County: 17.6 %Montezuma County17.6Rio Grande County: 17.6 %Rio Grande County17.6Hinsdale County: 17.5 %Hinsdale County17.5Archuleta County: 17.4 %Archuleta County17.4Costilla County: 17.1 %Costilla County17.1Montrose County: 16.7 %Montrose County16.7Summit County: 16.6 %Summit County16.6Moffat County: 15.8 %Moffat County15.8Delta County: 15.6 %Delta County15.6Las Animas County: 15.3 %Las Animas County15.3Grand County: 15.1 %Grand County15.1Otero County: 15.1 %Otero County15.1Adams County: 15 %Adams County15Sedgwick County: 14.9 %Sedgwick County14.9Logan County: 14.3 %Logan County14.3Mesa County: 14.3 %Mesa County14.3San Miguel County: 14.3 %San Miguel County14.3Weld County: 14.2 %Weld County14.2Conejos County: 13.9 %Conejos County13.9Cheyenne County: 13.8 %Cheyenne County13.8Chaffee County: 13.7 %Chaffee County13.7Denver County: 13.7 %Denver County13.7La Plata County: 13.7 %La Plata County13.7Baca County: 13.5 %Baca County13.5Mineral County: 13.4 %Mineral County13.4Gunnison County: 13 %Gunnison County13Custer County: 12.3 %Custer County12.3Rio Blanco County: 12.1 %Rio Blanco County12.1
%. 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

RankCounties2020 (%)Change on 2019
1Lake County23.5+7 pts
2Garfield County21.5+3.2 pts
3Jackson County20.4+4.3 pts
3Yuma County20.4+2.9 pts
5Morgan County19.5+2.2 pts
6Prowers County19+1.3 pts
7Kit Carson County18.3+2 pts
8Eagle County18.2+3.3 pts
8Phillips County18.2+3.4 pts
10Saguache County18.1-2.5 pts
11San Juan County18+4.8 pts
12Alamosa County17.6+2 pts
12Montezuma County17.6+1.7 pts
12Rio Grande County17.6+1.1 pts
15Hinsdale County17.5+4.7 pts
16Archuleta County17.4+2.2 pts
17Costilla County17.1-0.6 pts
18Montrose County16.7+2.1 pts
19Summit County16.6+3.4 pts
20Moffat County15.8+4.3 pts
21Delta County15.6+2.4 pts
22Las Animas County15.3+0.1 pts
23Grand County15.1+3.2 pts
23Otero County15.1+1.9 pts
25Adams County150 pts
26Sedgwick County14.9+1.5 pts
27Logan County14.3+1.6 pts
27Mesa County14.3+1.7 pts
27San Miguel County14.3+1.4 pts
30Weld County14.2+1.3 pts
31Conejos County13.9+1 pts
32Cheyenne County13.8-1 pts
33Chaffee County13.7+1.4 pts
33Denver County13.7+2.2 pts
33La Plata County13.7+1.2 pts
36Baca County13.5-2.9 pts
37Mineral County13.4+2.4 pts
38Gunnison County13+2.2 pts
39Custer County12.3-1.1 pts
40Rio Blanco County12.1+1.8 pts
40Routt County12.1+1.7 pts
42Arapahoe County12+1 pts
43Ouray County11.6+2.8 pts
44Dolores County11.50 pts
45Lincoln County11.4+0.5 pts
46Pueblo County11.3-0.4 pts
47Washington County11.1-0.2 pts
48Fremont County11+0.5 pts
49Bent County10.4-2.3 pts
50El Paso County10.3-0.2 pts
51Pitkin County10-0.7 pts
52Park County9.9+0.8 pts
53Crowley County9.8-4.8 pts
54Teller County9.3+0.7 pts
55Larimer County9.1+0.4 pts
56Elbert County9+1.6 pts
57Clear Creek County8.9+1.4 pts
57Huerfano County8.9-0.9 pts
59Kiowa County8.8-2.3 pts
60Boulder County8-0.4 pts
61Jefferson County7.9-0.4 pts
62Broomfield County6.8+0.8 pts
63Douglas County5.4+0.5 pts
64Gilpin County5+0.8 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-2020-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 Colorado by uninsured rate, ages 18 to 64 (US model-based estimate), 2020) [Data set]. Retrieved October 12, 2026, from https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-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 Colorado by uninsured rate, ages 18 to 64 (US model-based estimate), 2020. U.S. Census Bureau, 6 Aug. 2026, https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/colorado-counties?period=2020. 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 Colorado by uninsured rate, ages 18 to 64 (US model-based estimate), 2020. Dataset. Accessed October 12, 2026. https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip. Also distributed by Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/colorado-counties?period=2020.

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 Colorado by uninsured rate, ages 18 to 64 (US model-based estimate), 2020 [Dataset]. Available at: https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip, via Invokely: https://invokely.ai/rankings/uninsured-rate-ages-18-64/colorado-counties?period=2020 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_colorado_by_2020,
  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 Colorado by uninsured rate, ages 18 to 64 (US model-based estimate), 2020}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www2.census.gov/programs-surveys/sahie/datasets/time-series/estimates-acs/sahie-2020-csv.zip},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/colorado-counties?period=2020. 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-2020-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 Colorado by uninsured rate, ages 18 to 64 (US model-based estimate), 2020
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-2020-csv.zip
L2  - https://invokely.ai/rankings/uninsured-rate-ages-18-64/colorado-counties?period=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/uninsured-rate-ages-18-64/colorado-counties?period=2020.
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-2020-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)?

Lake County, with 23.5% in 2020, according to the U.S. Census Bureau.

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

Gilpin County, with 5% in 2020.

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 Colorado: more rankings