Medicare in Colorado by county

Most people with Medicare

Across Colorado, 1,091,700 people had Medicare in July 2026, 52% of them in Medicare Advantage or another Medicare health plan. The counties with the most:

1. El Paso County 131,525 with Medicare · 51% in Medicare Advantage · 20 Advantage plans with drug coverage
2. Jefferson County 124,862 with Medicare · 62% in Medicare Advantage · 32 Advantage plans with drug coverage
3. Arapahoe County 108,705 with Medicare · 57% in Medicare Advantage · 28 Advantage plans with drug coverage
4. Denver County 98,038 with Medicare · 60% in Medicare Advantage · 30 Advantage plans with drug coverage
5. Larimer County 78,147 with Medicare · 48% in Medicare Advantage · 19 Advantage plans with drug coverage
6. Adams County 72,522 with Medicare · 64% in Medicare Advantage · 31 Advantage plans with drug coverage
7. Douglas County 66,841 with Medicare · 51% in Medicare Advantage · 27 Advantage plans with drug coverage
8. Boulder County 63,299 with Medicare · 48% in Medicare Advantage · 28 Advantage plans with drug coverage
9. Weld County 59,210 with Medicare · 56% in Medicare Advantage · 20 Advantage plans with drug coverage
10. Mesa County 41,761 with Medicare · 46% in Medicare Advantage · 10 Advantage plans with drug coverage

All 64 counties, A to Z

• Adams County72,522 with Medicare · 64% in Medicare Advantage · 31 Advantage plans with drug coverage
• Alamosa County3,444 with Medicare · 46% in Medicare Advantage · 0 Advantage plans with drug coverage
• Arapahoe County108,705 with Medicare · 57% in Medicare Advantage · 28 Advantage plans with drug coverage
• Archuleta County4,830 with Medicare · 30% in Medicare Advantage · 2 Advantage plans with drug coverage
• Baca County951 with Medicare · 10% in Medicare Advantage · 0 Advantage plans with drug coverage
• Bent County1,184 with Medicare · 48% in Medicare Advantage · 6 Advantage plans with drug coverage
• Boulder County63,299 with Medicare · 48% in Medicare Advantage · 28 Advantage plans with drug coverage
• Broomfield County14,118 with Medicare · 58% in Medicare Advantage · 27 Advantage plans with drug coverage
• Chaffee County6,259 with Medicare · 36% in Medicare Advantage · 4 Advantage plans with drug coverage
• Cheyenne County407 with Medicare · 13% in Medicare Advantage · 0 Advantage plans with drug coverage
• Clear Creek County1,917 with Medicare · 56% in Medicare Advantage · 15 Advantage plans with drug coverage
• Conejos County2,076 with Medicare · 52% in Medicare Advantage · 8 Advantage plans with drug coverage
• Costilla County1,419 with Medicare · 56% in Medicare Advantage · 7 Advantage plans with drug coverage
• Crowley County914 with Medicare · 55% in Medicare Advantage · 7 Advantage plans with drug coverage
• Custer County2,154 with Medicare · 44% in Medicare Advantage · 6 Advantage plans with drug coverage
• Delta County10,707 with Medicare · 47% in Medicare Advantage · 7 Advantage plans with drug coverage
• Denver County98,038 with Medicare · 60% in Medicare Advantage · 30 Advantage plans with drug coverage
• Dolores County615 with Medicare · 30% in Medicare Advantage · 2 Advantage plans with drug coverage
• Douglas County66,841 with Medicare · 51% in Medicare Advantage · 27 Advantage plans with drug coverage
• Eagle County8,113 with Medicare · 17% in Medicare Advantage · 0 Advantage plans with drug coverage
• El Paso County131,525 with Medicare · 51% in Medicare Advantage · 20 Advantage plans with drug coverage
• Elbert County6,164 with Medicare · 50% in Medicare Advantage · 13 Advantage plans with drug coverage
• Fremont County13,692 with Medicare · 59% in Medicare Advantage · 19 Advantage plans with drug coverage
• Garfield County11,008 with Medicare · 14% in Medicare Advantage · 0 Advantage plans with drug coverage
• Gilpin County1,302 with Medicare · 53% in Medicare Advantage · 12 Advantage plans with drug coverage
• Grand County3,272 with Medicare · 35% in Medicare Advantage · 8 Advantage plans with drug coverage
• Gunnison County2,948 with Medicare · 21% in Medicare Advantage · 7 Advantage plans with drug coverage
• Hinsdale County248 with Medicare · 27% in Medicare Advantage · 7 Advantage plans with drug coverage
• Huerfano County2,713 with Medicare · 53% in Medicare Advantage · 6 Advantage plans with drug coverage
• Jackson County349 with Medicare · 28% in Medicare Advantage · 6 Advantage plans with drug coverage
• Jefferson County124,862 with Medicare · 62% in Medicare Advantage · 32 Advantage plans with drug coverage
• Kiowa County374 with Medicare · 18% in Medicare Advantage · 5 Advantage plans with drug coverage
• Kit Carson County1,635 with Medicare · 13% in Medicare Advantage · 0 Advantage plans with drug coverage
• La Plata County13,716 with Medicare · 31% in Medicare Advantage · 5 Advantage plans with drug coverage
• Lake County1,152 with Medicare · 35% in Medicare Advantage · 6 Advantage plans with drug coverage
• Larimer County78,147 with Medicare · 48% in Medicare Advantage · 19 Advantage plans with drug coverage
• Las Animas County4,603 with Medicare · 49% in Medicare Advantage · 4 Advantage plans with drug coverage
• Lincoln County1,042 with Medicare · 32% in Medicare Advantage · 6 Advantage plans with drug coverage
• Logan County4,617 with Medicare · 38% in Medicare Advantage · 3 Advantage plans with drug coverage
• Mesa County41,761 with Medicare · 46% in Medicare Advantage · 10 Advantage plans with drug coverage
• Mineral County319 with Medicare · 35% in Medicare Advantage · 7 Advantage plans with drug coverage
• Moffat County2,729 with Medicare · 13% in Medicare Advantage · 0 Advantage plans with drug coverage
• Montezuma County7,912 with Medicare · 33% in Medicare Advantage · 2 Advantage plans with drug coverage
• Montrose County13,178 with Medicare · 41% in Medicare Advantage · 5 Advantage plans with drug coverage
• Morgan County5,764 with Medicare · 39% in Medicare Advantage · 3 Advantage plans with drug coverage
• Otero County4,838 with Medicare · 61% in Medicare Advantage · 3 Advantage plans with drug coverage
• Ouray County1,745 with Medicare · 25% in Medicare Advantage · 7 Advantage plans with drug coverage
• Park County4,550 with Medicare · 45% in Medicare Advantage · 12 Advantage plans with drug coverage
• Phillips County1,088 with Medicare · 17% in Medicare Advantage · 0 Advantage plans with drug coverage
• Pitkin County3,434 with Medicare · 9% in Medicare Advantage · 5 Advantage plans with drug coverage
• Prowers County2,627 with Medicare · 18% in Medicare Advantage · 0 Advantage plans with drug coverage
• Pueblo County40,995 with Medicare · 62% in Medicare Advantage · 18 Advantage plans with drug coverage
• Rio Blanco County1,537 with Medicare · 31% in Medicare Advantage · 2 Advantage plans with drug coverage
• Rio Grande County3,484 with Medicare · 42% in Medicare Advantage · 0 Advantage plans with drug coverage
• Routt County5,218 with Medicare · 16% in Medicare Advantage · 1 Advantage plans with drug coverage
• Saguache County1,734 with Medicare · 45% in Medicare Advantage · 6 Advantage plans with drug coverage
• San Juan County177 with Medicare · 19% in Medicare Advantage · 7 Advantage plans with drug coverage
• San Miguel County1,359 with Medicare · 23% in Medicare Advantage · 2 Advantage plans with drug coverage
• Sedgwick County762 with Medicare · 10% in Medicare Advantage · 0 Advantage plans with drug coverage
• Summit County4,546 with Medicare · 25% in Medicare Advantage · 7 Advantage plans with drug coverage
• Teller County7,667 with Medicare · 53% in Medicare Advantage · 17 Advantage plans with drug coverage
• Washington County1,162 with Medicare · 29% in Medicare Advantage · 6 Advantage plans with drug coverage
• Weld County59,210 with Medicare · 56% in Medicare Advantage · 20 Advantage plans with drug coverage
• Yuma County2,020 with Medicare · 14% in Medicare Advantage · 0 Advantage plans with drug coverage

Sources: CMS Medicare Monthly Enrollment, July 2026, and the CMS 2027 plan landscape. Medicare Advantage here includes other Medicare health plans, such as cost plans and PACE. Before you meet any agent, check their Colorado license.

Keep reading

• How to find a good Medicare agent near youWhere to look for a local Medicare agent, how to narrow the list to one or two, and the five-minute checks to do before you share anything.
• Medicare Open Enrollment checklist: what to check before December 7A step-by-step checklist for the October 15 to December 7, 2026 Open Enrollment Period: what to read in your plan's letter, what's changing for 2027, what you can switch, and what happens if you do nothing.
• Moving to another state with Medicare: what changes and what to doOriginal Medicare moves with you; most Medicare Advantage and drug plans don't. What happens to each kind of coverage when you move, your window to switch, and why your agent must be licensed in your new state.