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Idaho public road miles

59,240 miles

Miles of public road in Idaho, 2024

−1.0% since 2023 (59,860 miles); +21.1% since 2014 (48,902 miles); +29.3% since 1999 (45,802 miles)

Source: Federal Highway Administration, Public road miles (computed by Understand Idaho). Data period 2024. Published . Newest release as of ; next expected by June 2027.

Miles of public road, summed from the functional-system rows of FHWA Highway Statistics table HM-20.

Comparison

Among 50 states and the District of Columbia, Idaho ranked 35th highest in 2024. Texas was highest at 326,028 miles and the District of Columbia lowest at 1,519 miles.

The largest category in road miles by road type is Rural Local at 38,379 miles; next is Rural Major Collector at 5,848 miles.

Historical data

Idaho public road miles, 1980 to 2024Idaho public road miles, 1980 to 2024. Idaho: 67,256 in 1980, 59,240 in 2024.020k40k60k80k198020002020MilesIdaho public road miles, 1980 to 2024Idaho public road miles, 1980 to 2024. Idaho: 67,256 in 1980, 59,240 in 2024.020k40k60k80k198020002020MilesIdaho public road miles, 1980 to 2024Idaho public road miles, 1980 to 2024. Idaho: 67,256 in 1980, 59,240 in 2024.020k40k60k80k19801990200020102020Miles

Source: FHWA, Public road miles (computed by Understand Idaho).

Data table (45 rows)
PeriodIdaho (miles)
198067,256.000
198167,442.000
198268,395.000
198368,447.000
198468,616.000
198569,169.000
198671,544.000
198771,639.000
198860,663.000
198961,317.000
199062,435.000
199156,831.000
199258,588.000
199358,835.000
199459,897.000
199559,733.000
199659,674.000
199760,440.000
199846,108.000
199945,802.000
200046,456.000
200146,308.000
200246,732.000
200346,927.000
200447,100.000
200547,129.000
200647,105.000
200748,416.000
200847,790.000
200948,180.000
201048,771.000
201148,555.000
201248,494.000
201348,082.000
201448,902.000
201551,162.000
201651,340.000
201752,437.000
201856,348.000
201952,519.000
202053,282.000
202154,033.000
202258,428.000
202359,860.000
202459,240.035

Compared with other states

Miles

  1. Texas326,028
  2. California177,607
  3. Illinois146,034
  4. Oregon79,052
  5. Washington78,909
  6. Montana74,705
  7. Idaho59,240
  8. Utah49,505
  9. Nevada47,564
  10. Wyoming31,689
  11. Rhode Island6,559
  12. Hawaii4,628
  13. District of Columbia1,519

Source: FHWA, Public road miles (computed by Understand Idaho).

Data table (51 rows)
State2024
1. Texas326,027.615
2. California177,607.363
3. Illinois146,033.900
4. Minnesota142,487.849
5. Kansas138,992.607
6. Missouri132,992.593
7. Georgia127,307.639
8. Florida124,581.044
9. Ohio122,970.367
10. Michigan122,055.850
11. Pennsylvania121,429.967
12. New York116,320.152
13. Wisconsin115,926.208
14. Oklahoma115,560.370
15. Iowa115,063.002
16. North Carolina108,827.016
17. Arkansas99,200.431
18. Alabama99,024.552
19. Indiana97,400.832
20. Tennessee95,944.805
21. Nebraska95,295.044
22. Colorado89,954.728
23. North Dakota88,564.891
24. South Dakota81,825.187
25. Kentucky79,677.790
26. Oregon79,052.450
27. Washington78,908.715
28. South Carolina78,432.233
29. Mississippi78,397.867
30. Arizona76,078.516
31. Virginia75,649.475
32. Montana74,704.802
33. New Mexico72,242.725
34. Louisiana66,515.343
35. Idaho59,240.035
36. Utah49,505.052
37. Nevada47,563.888
38. West Virginia39,138.150
39. New Jersey38,777.837
40. Massachusetts36,930.890
41. Maryland32,669.038
42. Wyoming31,689.366
43. Maine22,862.400
44. Connecticut21,471.660
45. Alaska17,653.842
46. New Hampshire16,268.646
47. Vermont14,229.099
48. Delaware6,695.110
49. Rhode Island6,558.867
50. Hawaii4,627.550
51. District of Columbia1,518.885

Road miles by road type

This breakdown is from Federal Highway Administration, on a different basis than the headline figure above. Public road length by rural/urban area and functional road system, from FHWA Highway Statistics table HM-20.

Miles

  1. Rural Local38,379
  2. Rural Major Collector5,848
  3. Urban Local5,363
  4. Rural Minor Collector3,763
  5. Rural Other Principal Arterial1,628
  6. Rural Minor Arterial1,414
  7. Urban Major Collector910.5
  8. Urban Minor Arterial719.3
  9. Rural Interstate517.0
  10. Urban Other Principal Arterial427.9
  11. Rural Other Freeways and Expressways100.9
  12. Urban Interstate94.983
  13. Urban Other Freeways and Expressways38.896
  14. Urban Minor Collector35.397

Source: FHWA, Highway Statistics series.

Data table (14 rows)
Road type2024 (miles)Share of total
Rural Local38,379.09564.8%
Rural Major Collector5,848.4979.9%
Urban Local5,363.4329.1%
Rural Minor Collector3,762.8356.4%
Rural Other Principal Arterial1,627.5162.7%
Rural Minor Arterial1,413.7682.4%
Urban Major Collector910.5291.5%
Urban Minor Arterial719.2701.2%
Rural Interstate516.9720.9%
Urban Other Principal Arterial427.9160.7%
Rural Other Freeways and Expressways100.9290.2%
Urban Interstate94.9830.2%
Urban Other Freeways and Expressways38.8960.1%
Urban Minor Collector35.3970.1%
  • Vehicle miles traveled (VM-2) is an estimate from each state's own travel monitoring program, not a direct count.
  • Traffic fatalities (FI-20) are Fatality Analysis Reporting System (FARS) counts as FHWA republishes them by functional system.
  • Vehicle registrations (MV-1) count registered vehicles, not owners; one business or agency vehicle counts once regardless of drivers.
  • The licensed-drivers table (DL-1C) starts in 2010 in this republication; earlier years are not available through this source.
  • No source table prints a state total for its category breakdown; a state total here is summed from the categories.
  • Puerto Rico appears in the source tables but is excluded here; it is not in this site's geography list.
  • Idaho's MV-1 vehicle-registration total rises from 1,378,190 in 2010 to 1,625,204 in 2011, about 18 percent. The increase concentrates in the Truck, Private (up 166,972) and Auto, Private (up 68,546) categories; FHWA's published MV-1 table carries no footnote for Idaho in either year explaining the change.
  • Some MV-1 rows, Idaho's included, carry a fractional vehicle count (for example, Idaho's 2012 Auto, Private row is 571,308.21) as FHWA's republication prints it. This dataset stores the figure as printed rather than rounding it.

Source

Organization
Federal Highway Administration
Dataset
Public road miles (computed by Understand Idaho)
Geography
States and the District of Columbia
Time coverage
1900-2024
Update frequency
Annual
Published
Newest release as of
; next expected by June 2027
Original file
https://datahub.transportation.gov/browse?q=highway%20statistics
License
Public domain. U.S. federal government work.
Our copy
Public road miles (computed by Understand Idaho)

Caveats

  • Computed by Understand Idaho from Highway Statistics series; it is not a figure the publisher releases.

Inputs: Highway Statistics series.

Cite as Understand Idaho, “Idaho public road miles”, https://understandidaho.com/transportation/road-miles/; cite the publisher above for the figures. See the data catalog.

This page was last updated .