Idaho Counties, County Seats and License Plate Designators

Ada, Boise
1A
Adams, Council
2A
Bannock, Pocatello
1B
Bear Lake, Paris
2B
Benewah, St Maries
3B
Bingham, Blackfoot
4B
Blaine, Hailey
5B
Boise, Idaho City
6B
Bonner, Sandpoint
7B
Bonneville, Idaho Falls
8B
Boundary, Bonners Ferry
9B
Butte, Arco
10B
Camas, Fairfield
1C
Canyon, Caldwell
2C
Caribou, Soda Springs
3C
Cassia, Burley
4C
Clark, Dubois
5C
Clearwater, Orofino
6C
Custer, Challis
7C
Elmore, Mountain Home
E
Franklin, Preston
1F
Fremont, St Anthony
2F
Gem, Emmett
1G
Gooding, Gooding
2G
Idaho, Grangeville
I
Jefferson, Rigby
1J
Jerome, Jerome
2J
Kootenai, Coeur d'Alene
K
Latah, Moscow
1L
Lemhi, Salmon
2L
Lewis, Nez Perce
3L
Lincoln, Shoshone
4L
Madison, Rexberg
1M
Minidoka, Rupert
2M
Nez Perce, Lewiston
N
Oneida, Malad
1O
Owyhee, Murphy
2O
Payette, Payette
1P
Power, American Falls
2P
Shoshone, Wallace
S
Teton, Driggs
1T
Twin Falls, Twin Falls
2T
Valley, Cascade
V
Washington, Weiser
W