Idaho Transportation Department
Vehicle registrations, traffic counts, crashes and fatalities, and highway funding.
https://itd.idaho.gov/ ยท State of Idaho
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License plate county codes
The Idaho Transportation Department table assigning each of the 44 Idaho counties the number-and-letter code that identifies it on standard license plates. Published as "Rules Governing License Plate Provisions, IDAPA 39.02.60, Section 100 (License Plate Provisions for Standard Plates), Subsection 01 (County Designations)".
- Organization
- Idaho Transportation Department
- Dataset
- License Plate Provisions rule, IDAPA 39.02.60
- Geography
- Counties
- Time coverage
- 2026
- Update frequency
- Irregular. The rule is amended through IDAPA rulemaking as needed, not on a periodic release schedule; each subsection carries its own effective-date stamp rather than a publication date.
- Published
- Original file
- https://adminrules.idaho.gov/rules/current/39/390260.pdf
- Methodology
- https://legislature.idaho.gov/statutesrules/idstat/Title49/T49CH4/SECT49-443/
- License
- Idaho public record.
- Our copy
- License Plate Provisions rule, IDAPA 39.02.60
Caveats
- The code applies only to standard plates issued under Idaho Code 49-402, not restricted, dealer, manufacturer, or legislative plate series.
- This is a lookup table, not a measurement: no observation, period, or unit is attached to a county's code.
County road miles
Miles of road maintained by each Idaho county, by surface type, from the Idaho Transportation Department's Financial Planning & Analysis Section.
- Organization
- Idaho Transportation Department
- Dataset
- Road Miles by County by Surface Type
- Geography
- Counties and Idaho
- Time coverage
- 2010-2018
- Update frequency
- Annual, but not published since the 2018 edition as of this check.
- Published
- Original file
- https://apps.itd.idaho.gov/apps/Fund/Local/SURTYPE18.pdf
- Methodology
- https://itd.idaho.gov/local-highway-dist-fund/
- License
- Idaho public record.
- Our copy
- Road Miles by County by Surface Type
Caveats
- This is road mileage maintained by the county itself, not every public road within the county: state highways, city streets and roads under a separate highway district (such as the Ada County Highway District) are not counted here. It is the mileage the Idaho Transportation Department's Local Highway Distribution Fund uses to divide funding among counties and highway districts.
- No edition has been published since the one covering 2018.
- The 2012 report prints two negative figures with no explanation, and both are carried as printed: Shoshone County's Low Bitumen (-9.076 miles) and Washington County's Less Than One Inch Bitumen (-0.369 miles). Each county's printed total is consistent with them.
Measures
- County-maintained road miles (miles): Total miles of road maintained by the county, all surface types.
- County-maintained road miles by surface type (miles): County-maintained road miles broken down by surface type.
This page was last updated .