Health insurance in Colorado
456,679 people under 65 in Colorado have no health coverage. 229,624 of them earn in the range a premium tax credit is built for.
Source: US Census Small Area Health Insurance Estimates, 2024 release.
Who is uninsured in Colorado
456,679 people under 65 in Colorado have no health coverage — 9.3% of the under-65 population, 21st highest of the 51 states and DC. 229,624 (50%) earn inside the premium tax credit range.
108,745 uninsured Colorado residents (24% of the total) earn under $22,025. Colorado expanded Medicaid, so that group mostly qualifies for it instead — and it enrolls year-round.
Where Colorado residents enroll, and by when
Colorado does not use HealthCare.gov. It runs Connect for Health Colorado at connectforhealthco.com, and sets its own enrollment dates — which are not always the federal ones. Applying at HealthCare.gov will redirect you.
Open Enrollment for Colorado: November 1, 2026 to January 15, 2027.
Checked 2026-09-01. 2027 dates moved nationally after a court ruling — what changed and why.
How enrollment works · If you missed the window
The 11 largest counties in Colorado
By under-65 population — 86% of Colorado's under-65 residents, from 64 counties with published estimates.
| County | Under 65 | Uninsured | In subsidy range | Share | Uninsured 50–64 |
|---|---|---|---|---|---|
| El Paso County | 629,088 | 8.6% | 28,831 | 53% | 7.2% |
| Denver County | 628,234 | 10.1% | 30,827 | 49% | 8.9% |
| Arapahoe County | 565,700 | 10.4% | 29,656 | 50% | 8.2% |
| Adams County | 474,927 | 12.9% | 32,359 | 53% | 12.5% |
| Jefferson County | 469,170 | 7.3% | 15,934 | 47% | 5.2% |
| Douglas County | 340,680 | 4.3% | 6,288 | 43% | 3.2% |
| Weld County | 316,930 | 10.0% | 16,213 | 51% | 8.9% |
| Larimer County | 300,404 | 7.0% | 10,264 | 49% | 5.5% |
| Boulder County | 263,213 | 7.3% | 8,823 | 46% | 5.9% |
| Pueblo County | 131,642 | 9.9% | 6,812 | 52% | 9.3% |
| Mesa County | 122,219 | 11.2% | 7,473 | 54% | 10.2% |
Source: US Census Small Area Health Insurance Estimates, 2024 release. "In subsidy range" counts uninsured under-65 residents earning 138–400% of the federal poverty level.