Medicare in Idaho by county

Most people with Medicare

Across Idaho, 417,781 people had Medicare in July 2026, 46% of them in Medicare Advantage or another Medicare health plan. The counties with the most:

1. Ada County 107,097 with Medicare · 55% in Medicare Advantage · 13 Advantage plans with drug coverage
2. Canyon County 49,664 with Medicare · 62% in Medicare Advantage · 13 Advantage plans with drug coverage
3. Kootenai County 48,831 with Medicare · 42% in Medicare Advantage · 4 Advantage plans with drug coverage
4. Bonneville County 22,850 with Medicare · 38% in Medicare Advantage · 6 Advantage plans with drug coverage
5. Twin Falls County 19,507 with Medicare · 56% in Medicare Advantage · 5 Advantage plans with drug coverage
6. Bannock County 17,929 with Medicare · 47% in Medicare Advantage · 4 Advantage plans with drug coverage
7. Bonner County 15,970 with Medicare · 39% in Medicare Advantage · 4 Advantage plans with drug coverage
8. Nez Perce County 11,086 with Medicare · 22% in Medicare Advantage · 1 Advantage plans with drug coverage
9. Bingham County 9,506 with Medicare · 42% in Medicare Advantage · 3 Advantage plans with drug coverage
10. Latah County 7,689 with Medicare · 25% in Medicare Advantage · 1 Advantage plans with drug coverage

All 44 counties, A to Z

• Ada County107,097 with Medicare · 55% in Medicare Advantage · 13 Advantage plans with drug coverage
• Adams County1,628 with Medicare · 36% in Medicare Advantage · 2 Advantage plans with drug coverage
• Bannock County17,929 with Medicare · 47% in Medicare Advantage · 4 Advantage plans with drug coverage
• Bear Lake County1,665 with Medicare · 12% in Medicare Advantage · 2 Advantage plans with drug coverage
• Benewah County3,281 with Medicare · 18% in Medicare Advantage · 0 Advantage plans with drug coverage
• Bingham County9,506 with Medicare · 42% in Medicare Advantage · 3 Advantage plans with drug coverage
• Blaine County6,391 with Medicare · 21% in Medicare Advantage · 1 Advantage plans with drug coverage
• Boise County2,571 with Medicare · 54% in Medicare Advantage · 9 Advantage plans with drug coverage
• Bonner County15,970 with Medicare · 39% in Medicare Advantage · 4 Advantage plans with drug coverage
• Bonneville County22,850 with Medicare · 38% in Medicare Advantage · 6 Advantage plans with drug coverage
• Boundary County4,164 with Medicare · 32% in Medicare Advantage · 2 Advantage plans with drug coverage
• Butte County762 with Medicare · 7% in Medicare Advantage · 0 Advantage plans with drug coverage
• Camas County325 with Medicare · 36% in Medicare Advantage · 3 Advantage plans with drug coverage
• Canyon County49,664 with Medicare · 62% in Medicare Advantage · 13 Advantage plans with drug coverage
• Caribou County1,534 with Medicare · 19% in Medicare Advantage · 2 Advantage plans with drug coverage
• Cassia County4,628 with Medicare · 39% in Medicare Advantage · 1 Advantage plans with drug coverage
• Clark County139 with Medicare · 29% in Medicare Advantage · 4 Advantage plans with drug coverage
• Clearwater County3,078 with Medicare · 16% in Medicare Advantage · 2 Advantage plans with drug coverage
• Custer County1,520 with Medicare · 16% in Medicare Advantage · 2 Advantage plans with drug coverage
• Elmore County5,673 with Medicare · 45% in Medicare Advantage · 6 Advantage plans with drug coverage
• Franklin County2,822 with Medicare · 33% in Medicare Advantage · 2 Advantage plans with drug coverage
• Fremont County2,933 with Medicare · 30% in Medicare Advantage · 5 Advantage plans with drug coverage
• Gem County5,907 with Medicare · 61% in Medicare Advantage · 9 Advantage plans with drug coverage
• Gooding County3,504 with Medicare · 49% in Medicare Advantage · 4 Advantage plans with drug coverage
• Idaho County5,658 with Medicare · 17% in Medicare Advantage · 0 Advantage plans with drug coverage
• Jefferson County5,338 with Medicare · 37% in Medicare Advantage · 6 Advantage plans with drug coverage
• Jerome County4,279 with Medicare · 54% in Medicare Advantage · 3 Advantage plans with drug coverage
• Kootenai County48,831 with Medicare · 42% in Medicare Advantage · 4 Advantage plans with drug coverage
• Latah County7,689 with Medicare · 25% in Medicare Advantage · 1 Advantage plans with drug coverage
• Lemhi County3,009 with Medicare · 9% in Medicare Advantage · 0 Advantage plans with drug coverage
• Lewis County1,844 with Medicare · 14% in Medicare Advantage · 0 Advantage plans with drug coverage
• Lincoln County980 with Medicare · 48% in Medicare Advantage · 2 Advantage plans with drug coverage
• Madison County4,067 with Medicare · 32% in Medicare Advantage · 4 Advantage plans with drug coverage
• Minidoka County4,567 with Medicare · 43% in Medicare Advantage · 1 Advantage plans with drug coverage
• Nez Perce County11,086 with Medicare · 22% in Medicare Advantage · 1 Advantage plans with drug coverage
• Oneida County1,165 with Medicare · 22% in Medicare Advantage · 4 Advantage plans with drug coverage
• Owyhee County2,708 with Medicare · 57% in Medicare Advantage · 9 Advantage plans with drug coverage
• Payette County6,630 with Medicare · 55% in Medicare Advantage · 10 Advantage plans with drug coverage
• Power County1,599 with Medicare · 34% in Medicare Advantage · 5 Advantage plans with drug coverage
• Shoshone County4,038 with Medicare · 34% in Medicare Advantage · 3 Advantage plans with drug coverage
• Teton County2,140 with Medicare · 14% in Medicare Advantage · 1 Advantage plans with drug coverage
• Twin Falls County19,507 with Medicare · 56% in Medicare Advantage · 5 Advantage plans with drug coverage
• Valley County3,643 with Medicare · 43% in Medicare Advantage · 6 Advantage plans with drug coverage
• Washington County3,462 with Medicare · 48% in Medicare Advantage · 8 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 Idaho 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.