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County Designations on Idaho License Plates

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Written by Don Wixom   

What County is that?

Many of you have asked me 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 1932-19331934-1944  1945-ON
AdaA11A1A
AdamsA22A2A
BannockA33A1B
Bear LakeA44A2B
BenewahA55A3B
BinghamA66A4B
BlaineA77A5B
BoiseA88A6B
BonnerA99A7B
BonnevilleB11P8B
BoundaryB22P9B
ButteB33P10B
CamasB44P1C
CanyonB55P2C
CaribouB66P3C
CassiaB77P4C
ClarkB88P5C
ClearwaterB99P6C
CusterH11H7C
ElmoreH22HE
FranklinH33H1F
FremontH44H2F
GemH55H1G
GoodingH66H2G
IdahoH77HI
JeffersonH88H1J
JeromeH99H2J
KootenaiK11KK
LatahK22K1L
LemhiK33K2L
LewisK44K3L
LincolnK55K4L
MadisonK66K1M
MinidokaK77K2M
Nez PerceK88KN
OneidaK99K1O
OwyheeR11R2O
PayetteR22R1P
PowerR33R2P
ShoshoneR44RS
TetonR55R1T
Twin FallsR66R2T
ValleyR77RV
WashingtonR88RW

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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