A
Ada County
County seat: Boise
Adams County
County seat: Council
B
Bannock County
County seat: Pocatello
Bear Lake County
County seat: Paris
Benewah County
County seat: St. Maries
Bingham County
County seat: Blackfoot
Blaine County
County seat: Hailey
Boise County
County seat: Idaho City
Bonner County
County seat: Sandpoint
Bonneville County
County seat: Idaho Falls
Boundary County
County seat: Bonners Ferry
Butte County
County seat: Arco
C
Camas County
County seat: Fairfield
Canyon County
County seat: Caldwell
Caribou County
County seat: Soda Springs
Cassia County
County seat: Burley
Clark County
County seat: Dubois
Clearwater County
County seat: Orofino
Custer County
County seat: Challis
E
Elmore County
County seat: Mountain Home
F
Franklin County
County seat: Preston
Fremont County
County seat: St. Anthony
G
Gem County
County seat: Emmett
Gooding County
County seat: Gooding
I
Idaho County
County seat: Grangeville
J
Jefferson County
County seat: Rigby
Jerome County
County seat: Jerome
K
Kootenai County
County seat: Coeur d'Alene
L
Latah County
County seat: Moscow
Lemhi County
County seat: Salmon
Lewis County
County seat: Nezperce
Lincoln County
County seat: Shoshone
M
Madison County
County seat: Rexburg
Minidoka County
County seat: Rupert
N
Nez Perce County
County seat: Lewiston
O
Oneida County
County seat: Malad City
Owyhee County
County seat: Murphy
P
Payette County
County seat: Payette
Power County
County seat: American Falls
S
Shoshone County
County seat: Wallace
T
Teton County
County seat: Driggs
Twin Falls County
County seat: Twin Falls
V
Valley County
County seat: Cascade
W
Washington County
County seat: Weiser