Counties in Idaho
Each county page says how cases move there under Idaho's rules, and lists the police agencies that serve it.
44 counties, largest first
- Ada County546,141 people · 5 agencies
- Canyon County275,123 people · 6 agencies
- Kootenai County191,864 people · 6 agencies
- Bonneville County135,771 people · 4 agencies
- Twin Falls County97,539 people · 5 agencies
- Bannock County91,591 people · 4 agencies
- Madison County55,172 people · 2 agencies
- Bonner County54,420 people · 4 agencies
- Bingham County51,153 people · 5 agencies
- Nez Perce County42,905 people · 3 agencies
- Latah County41,842 people · 3 agencies
- Jefferson County35,297 people · 2 agencies
- Elmore County29,465 people · 3 agencies
- Payette County27,824 people · 4 agencies
- Cassia County26,397 people · 2 agencies
- Jerome County26,362 people · 2 agencies
- Blaine County25,517 people · 5 agencies
- Minidoka County22,911 people · 4 agencies
- Gem County21,773 people · 2 agencies
- Idaho County17,874 people · 4 agencies
- Gooding County16,446 people · 4 agencies
- Franklin County15,889 people · 2 agencies
- Fremont County14,208 people · 3 agencies
- Shoshone County14,130 people · 6 agencies
- Boundary County13,997 people · 2 agencies
- Teton County13,254 people · 2 agencies
- Valley County12,831 people · 3 agencies
- Owyhee County12,661 people · 2 agencies
- Washington County11,583 people · 2 agencies
- Benewah County10,508 people · 3 agencies
- Clearwater County9,118 people · 3 agencies
- Boise County8,545 people · 2 agencies
- Lemhi County8,474 people · 2 agencies
- Power County8,246 people · 2 agencies
- Caribou County7,252 people · 3 agencies
- Bear Lake County6,727 people · 2 agencies
- Lincoln County5,603 people · 2 agencies
- Oneida County5,085 people · 2 agencies
- Adams County5,013 people · 2 agencies
- Custer County4,636 people · 2 agencies
- Lewis County3,704 people · 2 agencies
- Butte County2,783 people · 2 agencies
- Camas County1,316 people · 1 agencies
- Clark County783 people · 1 agencies
Population: Census Bureau county population estimates, Vintage 2025 (cc-est2025-alldata), July 1, 2025.