Most of our license plates in Idaho (since 1945) have a letter or numeric letter combination designating which county the vehicle is registered. Personalized plates and other special plates do not carry this designation. As you travel through Idaho, it is fun to see where the other drivers are going and coming from.
| County | Letter Designation |
| Ada | 1A |
| Adams | 2A |
| Bannock | 1B |
| Bear Lake | 2B |
| Benewah | 3B |
| Bingham | 4B |
| Blaine | 5B |
| Boise | 6B |
| Bonner | 7B |
| Bonneville | 8B |
| Boundary | 9B |
| Butte | 10B |
| Camas | 1C |
| Canyon | 2C |
| Caribou | 3C |
| Cassia | 4C |
| Clark | 5C |
| Clearwater | 6C |
| Custer | 7C |
| Elmore | E |
| Franklin | 1F |
| Fremont | 2F |
| Gem | 1G |
| Gooding | 2G |
| Idaho | I |
| Jefferson | 1J |
| Jerome | 2J |
| Kootenai | K |
| Latah | 1L |
| Lemhi | 2L |
| Lewis | 3L |
| Lincoln | 4L |
| Madison | 1M |
| Minidoka | 2M |
| Nez Perce | N |
| Oneida | 1O |
| Owyhee | 2O |
| Payette | 1P |
| Power | 2P |
| Shoshone | S |
| Teton | 1T |
| Twin Falls | 2T |
| Valley | V |
| Washington | W |
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