Idaho License Plate Pre-Fix
Many of you have asked the association for a reference on Idaho License Plates and what those pre-fix designation mean. Well...here it is! You can now view the number and letter reference to know which Idaho county certain vehicles are from.
Keep in mind, those who have personalized plates do not have the county designations, so there's no telling from where they came!
County Designations 1932-Present
| County |
1932-1933 |
1934-1944 |
1945-ON |
| Ada |
A1 |
1A |
1A |
| Adams |
A2 |
2A |
2A |
| Bannock |
A3 |
3A |
1B |
| Bear Lake |
A4 |
4A |
2B |
| Benewah |
A5 |
5A |
3B |
| Bingham |
A6 |
6A |
4B |
| Blaine |
A7 |
7A |
5B |
| Boise |
A8 |
8A |
6B |
| Bonner |
A9 |
9A |
7B |
| Bonneville |
B1 |
1P |
8B |
| Boundary |
B2 |
2P |
9B |
| Butte |
B3 |
3P |
10B |
| Camas |
B4 |
4P |
1C |
| Canyon |
B5 |
5P |
2C |
| Caribou |
B6 |
6P |
3C |
| Cassia |
B7 |
7P |
4C |
| Clark |
B8 |
8P |
5C |
| Clearwater |
B9 |
9P |
6C |
| Custer |
H1 |
1H |
7C |
| Elmore |
H2 |
2H |
E |
| Franklin |
H3 |
3H |
1F |
| Fremont |
H4 |
4H |
2F |
| Gem |
H5 |
5H |
1G |
| Gooding |
H6 |
6H |
2G |
| Idaho |
H7 |
7H |
I |
| Jefferson |
H8 |
8H |
1J |
| Jerome |
H9 |
9H |
2J |
| Kootenai |
K1 |
1K |
K |
| Latah |
K2 |
2K |
1L |
| Lemhi |
K3 |
3K |
2L |
| Lewis |
K4 |
4K |
3L |
| Lincoln |
K5 |
5K |
4L |
| Madison |
K6 |
6K |
1M |
| Minidoka |
K7 |
7K |
2M |
| Nez Perce |
K8 |
8K |
N |
| Oneida |
K9 |
9K |
1O |
| Owyhee |
R1 |
1R |
2O |
| Payette |
R2 |
2R |
1P |
| Power |
R3 |
3R |
2P |
| Shoshone |
R4 |
4R |
S |
| Teton |
R5 |
5R |
1T |
| Twin Falls |
R6 |
6R |
2T |
| Valley |
R7 |
7R |
V |
| Washington |
R8 |
8R |
W |
County License plate prefixes: before 1932, a straight numerical system was used with no county prefix. In 1932 and 1933, the letters A, B, H, K, and R were used with the numerals 1 through-9 as county prefixes. From 1934 through 1942, the same prefixes were used except that the B was changed to a P. In 1945 the county prefix designation was started.
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