License Plates in Idaho follow a recognizable numbering system that helps identify vehicles and connect registrations with the appropriate county. The plate number format can include a county designator, registration numbers, and other identifying elements displayed on the plate. Idaho uses numeric county codes, making it possible to identify the county associated with a vehicle registration by checking the designated number. Knowing how these codes appear and where they are placed can make it easier to read an Idaho plate and distinguish registration information from the vehicle’s unique identification number.
License Plates display county information through a two-digit designator assigned to each Idaho county. Ada County, for example, uses code 1, while Canyon County uses code 2, and other counties have their own assigned numbers. These codes appear before the remaining plate characters and form part of Idaho’s registration numbering system. Checking the county code can provide useful information about the registration location without treating it as the vehicle owner’s current address. The format may vary by plate type, so the complete character arrangement matters when reading a plate.
How to Read an Idaho License Plate Number
How to Read an Idaho License Plate Number explains how to identify the county designator, match it with the correct Idaho county, and distinguish the county code from the remaining plate sequence. This section provides a simple way to read an Idaho standard plate while clarifying what the plate number can and cannot tell you about the vehicle or its registration.
Find the County Designator
Start by locating the county code on the Idaho standard license plate. The county designator identifies the registration county associated with the vehicle.
- Look for the letter or number-and-letter code on the plate.
- 1A represents Ada County.
- 1B represents Bannock County.
- 2T represents Twin Falls County.
Match the Code to the Registration County
Compare the identified code with Idaho’s official county-code list to determine the associated registration county.
- 1A — Ada County
- K — Kootenai County
- V — Valley County
- The full Idaho county-code list includes a designated code for each county.
Separate the County Code From the Plate Sequence
Do not treat the entire plate number as the county code. The county designator identifies the registration county, while the remaining letters and numbers form the plate sequence or serial characters.
- County designator: Identifies the associated Idaho county.
- Plate sequence: Distinguishes the individual registration.
- Complete plate number: Combines these identifying elements.
Interpret the Complete Plate Carefully
The complete Idaho license plate contains more than its county code. After identifying the county designation, read the remaining characters as part of the vehicle’s assigned registration identification.
- Identify the county designator first.
- Read the remaining plate sequence separately.
- Do not use the county code alone to determine the owner’s identity, complete vehicle history, or current location.
Idaho License Plate County Codes by County
Idaho License Plate County Codes by County provides a quick reference for the county designators used on applicable Idaho standard license plates. Each Idaho county has an assigned code that helps identify the county associated with vehicle registration. This section lists the county codes by county name, making it easier to read an Idaho license plate and identify its registration county.
How Idaho County Codes Work
An Idaho county code is the county designator used on applicable standard license plates to show the Idaho county connected with the vehicle’s registration. Idaho’s administrative rules state that county designations are used on plates for passenger cars, pickup trucks up to 8,000 pounds gross weight, hearses, ambulances, wreckers, certain farm vehicles, and recreational trailers. The designator generally combines a number with the first letter of the county name, such as 1A for Ada and 2A for Adams. When several counties share the same first letter, Idaho assigns sequential numbers to distinguish them.
How the Number-Letter County System Works
The numbering system is easiest to read by looking at counties that begin with the same letter. Idaho assigns a sequential number before the first letter for those counties.
- 1A = Ada
- 2A = Adams
- 1B = Bannock
- 2B = Bear Lake
- 10B = Butte
The number does not represent the county’s population, geographic location, or vehicle count. It is simply part of Idaho’s established county designation system. Some counties have enough shared first letters to require several numbered designators, while counties with unique first letters can use a single-letter code.
Why Some Counties Have a Number and Others Have Only a Letter
Some Idaho county license plate codes use only one letter because no other Idaho county in the official system needs the same first-letter designation. Examples include:
- E = Elmore
- I = Idaho
- K = Kootenai
- N = Nez Perce
- S = Shoshone
- V = Valley
- W = Washington
By comparison, counties such as Ada and Adams both begin with “A,” so Idaho uses 1A and 2A to distinguish them. The same approach appears with groups such as the B, C, F, G, J, L, M, O, P, and T counties.
What Does an Idaho County Designator Tell You?
The county designator provides county identification for the vehicle registration associated with the plate. When reading an Idaho standard plate, it can help determine the registration county and distinguish the county portion of the plate number from the remaining serial characters. This makes the code useful for identifying the plate’s county designation without treating the entire plate number as the county code.
- Registration county: Shows the Idaho county associated with registration.
- Plate identification: Helps distinguish the county portion of a standard plate.
- Vehicle registration: Forms part of the state’s plate-number system.
A county code should not be treated as a complete vehicle history or as proof of where the vehicle is currently located.
Does the County Code Identify the Owner?
No. County identification is not owner identification. The code indicates the Idaho county associated with the vehicle’s registration, but it does not reveal the owner’s name, address, or complete ownership history. The remaining plate sequence provides additional registration identification, but a county designator by itself is not a personal identifier.
Idaho License Plate County Codes by County
Idaho currently uses 44 county designations in its standard plate system. The official Idaho Administrative Code lists the following designators. The county codes below are organized alphabetically so they can also work as a quick Idaho license plate by county reference.
Ada to Bonneville County Codes
| County | Plate Code |
|---|---|
| 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 |
These are the first 12 entries in Idaho’s official county code schedule. For example, both Ada and Adams begin with A, so they receive 1A and 2A, while the B counties continue in numerical order from 1B through 10B.
Camas to Jefferson County Codes
| County | Plate Code |
|---|---|
| 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 |
The same pattern continues with the C group: 1C through 7C. Elmore and Idaho use single-letter codes because their designated letters are unique in the county schedule. Franklin and Fremont use 1F and 2F, while Gem and Gooding use 1G and 2G.
Jerome to Washington County Codes
| County | Plate Code |
|---|---|
| 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 |
Idaho License Plate Codes for Different Vehicle Types
County designators and plate-number formats can vary based on the vehicle’s classification. Standard passenger vehicles, pickup trucks, farm vehicles, recreational trailers, and other vehicle types may follow different plate and registration rules. This section highlights the role of vehicle classification, county designation, plate type, and serial characters when identifying an Idaho license plate.
Standard Passenger Vehicles
Standard passenger vehicles in Idaho can use county-coded plates showing the designator associated with the vehicle’s registration county. This system applies to qualifying passenger cars registered under Idaho’s standard plate provisions. The county designation appears as part of the plate’s identification format, while the remaining characters provide the assigned registration sequence. The exact appearance can vary by plate type, so the vehicle classification should be considered when reading an Idaho plate.
- County designation: Identifies the registration county.
- Plate sequence: Provides the remaining registration identification.
- Plate type: Determines which formatting rules apply.
Pickup Trucks and Other Standard Vehicles
Idaho’s standard county-designator rules also cover qualifying pickup trucks and other standard vehicles. Current administrative provisions include noncommercial motor vehicles up to 60,000 pounds under the applicable standard registration system, along with recreational trailers. This means the county code system is broader than passenger cars alone, but it does not mean every Idaho vehicle uses exactly the same plate format. Vehicle classification can affect the applicable plate type and identification structure.
Farm Vehicles, Recreational Trailers, and Motor Homes
Certain farm vehicles, recreational trailers, and motor homes have their own registration classifications and plate requirements. Idaho’s administrative rules have specified identifying characters and county designations for different vehicle categories, but readers should avoid assuming that older published sequences are identical to today’s production format. Current ITD and administrative information should be used when identifying a specific plate.
- Vehicle classification: Determines the applicable plate program.
- Unique serial number: Remaining characters may identify the registration within the applicable system.
- County designation: May identify the county connected with registration.
- Plate format: Can differ between standard vehicles, recreational vehicles, trailers, and specialized classifications.
Do Specialty and Personalized Idaho Plates Use County Codes?
How county designators differ between standard Idaho plates and other plate programs. Specialty and personalized plates can follow different identification formats, so the county code found on a standard plate may not appear in the same way. This section clarifies the role of plate type, personalized text, and program-specific design features when reading an Idaho plate.
Standard Plates vs Specialty Plates
Standard Idaho plates and specialty plates can use different identification formats. County designators are a feature of applicable standard plates, while many specialty programs use their own plate design and identifying format. ITD specifically notes that special program and personalized plates generally do not receive the standard county designation. Therefore, a plate without a familiar county code is not necessarily an incorrectly issued Idaho plate; its program and vehicle classification may explain the difference.
Personalized Plate Number Format
A personalized plate number format is based on a combination selected by the registrant rather than a standard assigned sequence. Idaho allows eligible applicants to choose letters and numbers within the character limit established for the selected plate type. The requested combination must also satisfy availability and content requirements. Because personalization changes the character sequence while the design can remain standard or specialty-based, users should check the specific plate program before trying to decode it as a county-coded plate.
- Customer-selected characters: The registrant chooses the approved combination.
- Character limits: Depend on the selected plate type.
- Approval: The requested text must satisfy ITD availability and content rules.
Why Plate Type Matters When Decoding a Number
Not every Idaho plate follows the same visual sequence. A standard plate, specialty plate, personalized plate, motorcycle plate, trailer plate, or other specialized plate can have different formatting rules. When decoding an Idaho plate number, first identify the plate type, then determine whether a county designator is expected. This prevents incorrectly treating a personalized character combination or specialty-program identifier as a standard county code.
Idaho License Plate Number Format vs County Code
The Idaho license plate number format describes the complete arrangement of letters, numbers, county designators, and other identifying characters appearing on the plate. A county code or county designator is only the portion used to identify the registration county. The remaining plate sequence consists of assigned characters used to distinguish the particular registration.
| Term | Meaning |
|---|---|
| Number format | Overall structure and arrangement of plate characters |
| County code/designator | Portion identifying the associated registration county |
| Plate sequence | Remaining assigned characters used for registration identification |
| Alphanumeric format | Combination of permitted letters and numbers |
History of Idaho License Plate County Codes
Explores how Idaho’s county-based plate identification system developed and changed over different license plate periods. This section briefly covers early county numbering, the development of the modern county-coding system, and the differences between current county codes and historical plates or vintage Idaho plates.
Early Idaho County Numbering
Idaho’s county-coded plate system developed as a way to associate standard license plates with the county handling the vehicle’s registration. Earlier Idaho plates used different numbering and design conventions than today’s plates. Historical collector references show multiple plate periods, including separate systems for 1932, 1933, and 1934–1942, followed by later changes in plate design and numbering.
The Modern County-Coding System
The modern Idaho county designator system has historical roots and has been used for decades to distinguish counties with shared first letters. Number-and-letter combinations such as 1A, 2A, and 1B allow counties with the same initial to receive distinct identifiers, while counties with unique initials can use a single-letter designation. This system remains an important feature of applicable standard Idaho plates.
Current Codes vs Historical Codes
Historical Idaho license plates should not automatically be decoded using today’s county-code list. Vintage plates can display different numbering conventions, materials, colors, and county identifiers depending on the year of issue. Collector resources document multiple historical periods, including 1932, 1933, 1934–1942, and later systems. For a modern registration question, use the current ITD county-designator information rather than applying historical conventions to today’s plates.
Frequently Asked Questions
Idaho License Plate Codes cover common searches about plate number formats, county designators, letters and numbers, and specific county codes. These answers provide quick clarification for readers trying to identify the registration county associated with an Idaho license plate.
What is the Idaho license plate number format?
The Idaho license plate number format uses letters and numbers as part of the vehicle’s registration identification. On applicable standard plates, a county designator appears with the assigned plate sequence. The county portion identifies the registration county, while the remaining characters distinguish the vehicle’s registration within Idaho’s plate system.
What do the numbers and letters on an Idaho plate mean?
The numbers and letters on an Idaho plate can represent different parts of the registration identification. On applicable standard plates, the county designator identifies the registration county, while the remaining alphanumeric characters form the assigned plate sequence. The meaning depends on the plate type, because specialty and personalized plates can follow different formats.
What does 1A mean on an Idaho license plate?
1A is the Idaho county designator for Ada County. When 1A appears as the applicable county designation on a standard Idaho plate, it indicates that the vehicle’s registration is associated with Ada County. The code does not identify the vehicle owner or provide a complete history of the vehicle.
What Idaho county is 2A?
2A is the county code for Adams County, Idaho. Idaho uses numbered county designators when multiple counties share the same first letter. Ada County uses 1A, while Adams County uses 2A. These designators are associated with the vehicle’s registration county and are separate from the remaining characters in the complete plate number.
What county is 2T on an Idaho license plate?
2T is the county designator for Twin Falls County, Idaho. The number distinguishes Twin Falls from other Idaho counties using the same initial-letter pattern. When reading a standard Idaho plate, 2T identifies the registration county, while the characters following the county designation form the remaining plate sequence.