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These codes were established in 1932 and remain in use today.

County Code #: County (County Seat)

1A: Ada (Boise) 2A: Adams (Council) 1B: Bannock (Pocatello) 2B: Bear Lake (Paris) 3B: Benewah (St. Maries) 4B: Bingham (Blackfoot) 5B: Blaine (Hailey) 6B: Boise (Idaho City) 7B: Bonner (Sandpoint) 8B: Bonneville (Idaho Falls) 9B: Boundary (Bonner's Ferry) 10B: Butte (Arco) 1C: Camas (Fairfield) 2C: Canyon (Caldwell) 3C: Caribou (Soda Springs)

4C: Cassia (Burley) 5C: Clark (Dubois) 6C: Clearwater (Orofino) 7C: Custer (Challis) E: Elmore (Mountain Home) 1F: Franklin (Preston) 2F: Fremont (St. Anthony) 1G: Gem (Emmett) 2G: Gooding (Gooding) I: Idaho (Grangeville) 1J: Jefferson (Rigby) 2J: Jerome (Jerome) K: Kootenai (Coeur d'Alene) 1L: Latah (Moscow) 2L: Lemhi (Salmon)

3L: Lewis (Nez Perce) 4L: Lincoln (Shoshone) 1M: Madison (Rexburg) 2M: Minidoka (Rupert) N: Nez Perce (Lewiston) 1O: Oneida (Malad City) 2O: Owyhee (Murphy) 1P: Payette (Payette) 2P: Power (American Falls) S: Shoshone (Wallace) 1T: Teton (Driggs) 2T: Twin Falls (Twin Falls) V: Valley (Cascade) W: Washington (Weiser)

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