Idaho counties
Medicare Advantage and marketplace plans are set by area, so start with your county. 44 listed.
| County | Population (2023 est.) | Rank in Idaho |
|---|---|---|
| Ada County | 524,673 | 1 |
| Adams County | 4,903 | 39 |
| Bannock County | 90,400 | 6 |
| Bear Lake County | 6,766 | 36 |
| Benewah County | 10,369 | 30 |
| Bingham County | 50,395 | 9 |
| Blaine County | 25,041 | 17 |
| Boise County | 8,517 | 32 |
| Bonner County | 52,547 | 8 |
| Bonneville County | 131,366 | 4 |
| Boundary County | 13,557 | 25 |
| Butte County | 2,758 | 42 |
| Camas County | 1,232 | 43 |
| Canyon County | 257,674 | 2 |
| Caribou County | 7,219 | 35 |
| Cassia County | 25,696 | 15 |
| Clark County | 801 | 44 |
| Clearwater County | 9,214 | 31 |
| Custer County | 4,523 | 40 |
| Elmore County | 29,724 | 13 |
| Franklin County | 15,494 | 22 |
| Fremont County | 14,196 | 23 |
| Gem County | 21,071 | 19 |
| Gooding County | 16,061 | 21 |
| Idaho County | 17,890 | 20 |
| Jefferson County | 34,198 | 12 |
| Jerome County | 25,479 | 16 |
| Kootenai County | 185,010 | 3 |
| Latah County | 41,301 | 11 |
| Lemhi County | 8,441 | 33 |
| Lewis County | 3,739 | 41 |
| Lincoln County | 5,450 | 37 |
| Madison County | 54,547 | 7 |
| Minidoka County | 22,480 | 18 |
| Nez Perce County | 42,987 | 10 |
| Oneida County | 4,953 | 38 |
| Owyhee County | 12,722 | 26 |
| Payette County | 27,279 | 14 |
| Power County | 8,253 | 34 |
| Shoshone County | 14,026 | 24 |
| Teton County | 12,549 | 28 |
| Twin Falls County | 95,156 | 5 |
| Valley County | 12,644 | 27 |
| Washington County | 11,425 | 29 |
Population: U.S. Census Bureau Population Estimates, 2023.
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Call 855-367-1095Reviewed by Richard Lander, licensed insurance agent (NPN 21255551), Lander LLC. Last updated October 3, 2026. This page is educational and is not a quote, an offer of coverage, or legal or tax advice.