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Understand Idaho

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 .

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

Change and comparison

From 1980 (67,256 miles) to 2024 (59,240 miles), the change was −11.9%.

Over the most recent 5 years, 2019 (52,519 miles) to 2024 (59,240 miles), the change was +12.8%.

The series high is 71,639 miles in 1987 and the low is 45,802 miles in 1999.

Among 50 states and the District of Columbia, Idaho ranked 35th highest in 2024. Texas was highest at 326,027.615 miles and District of Columbia lowest at 1,518.885 miles.

Among Idaho and its 6 neighboring states, Idaho ranks 4th highest; Montana is next above at 74,704.802 miles and Utah next below at 49,505.052 miles.

Historical data

Idaho public road miles, 1980 to 2024Idaho public road miles, 1980 to 2024. Idaho: 67,256 in 1980, 59,240.035 in 2024.020k40k60k80k198020002020IdahoMilesIdaho public road miles, 1980 to 2024Idaho public road miles, 1980 to 2024. Idaho: 67,256 in 1980, 59,240.035 in 2024.020k40k60k80k198020002020IdahoMilesIdaho public road miles, 1980 to 2024Idaho public road miles, 1980 to 2024. Idaho: 67,256 in 1980, 59,240.035 in 2024.020k40k60k80k19801990200020102020IdahoMiles

Source: Federal Highway Administration, Public road miles (computed by Understand Idaho). Published .

Data table (45 rows)
PeriodIdaho (miles)
198067,256
198167,442
198268,395
198368,447
198468,616
198569,169
198671,544
198771,639
198860,663
198961,317
199062,435
199156,831
199258,588
199358,835
199459,897
199559,733
199659,674
199760,440
199846,108
199945,802
200046,456
200146,308
200246,732
200346,927
200447,100
200547,129
200647,105
200748,416
200847,790
200948,180
201048,771
201148,555
201248,494
201348,082
201448,902
201551,162
201651,340
201752,437
201856,348
201952,519
202053,282
202154,033
202258,428
202359,860
202459,240.035

Road miles by road type

Public road length by rural/urban area and functional road system, from FHWA Highway Statistics table HM-20.

  1. Rural Local38,379.095
  2. Rural Major Collector5,848.497
  3. Urban Local5,363.432
  4. Rural Minor Collector3,762.835
  5. Rural Other Principal Arterial1,627.516
  6. Rural Minor Arterial1,413.768
  7. Urban Major Collector910.529
  8. Urban Minor Arterial719.27
  9. Rural Interstate516.972
  10. Urban Other Principal Arterial427.916
  11. Rural Other Freeways and Expressways100.929
  12. Urban Interstate94.983
  13. Urban Other Freeways and Expressways38.896
  14. Urban Minor Collector35.397

Source: Federal Highway Administration, Highway Statistics series. Data period 2024. Published .

Data table (14 rows)
Road type2024 (miles)
Rural Local38,379.095
Rural Major Collector5,848.497
Urban Local5,363.432
Rural Minor Collector3,762.835
Rural Other Principal Arterial1,627.516
Rural Minor Arterial1,413.768
Urban Major Collector910.529
Urban Minor Arterial719.27
Rural Interstate516.972
Urban Other Principal Arterial427.916
Rural Other Freeways and Expressways100.929
Urban Interstate94.983
Urban Other Freeways and Expressways38.896
Urban Minor Collector35.397

Compared with other states

  1. Texas326,027.615
  2. California177,607.363
  3. Illinois146,033.9
  4. Oregon79,052.45
  5. Washington78,908.715
  6. Montana74,704.802
  7. Idaho59,240.035
  8. Utah49,505.052
  9. Nevada47,563.888
  10. Wyoming31,689.366
  11. Rhode Island6,558.867
  12. Hawaii4,627.55
  13. District of Columbia1,518.885

Source: Federal Highway Administration, Public road miles (computed by Understand Idaho). Data period 2024. Published .

The first 10 of 51 rows; the full table is below.

State2024
1. Texas326,027.615
2. California177,607.363
3. Illinois146,033.9
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. Michigan122,055.85
Data table (51 rows)
State2024
1. Texas326,027.615
2. California177,607.363
3. Illinois146,033.9
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. Michigan122,055.85
11. Pennsylvania121,429.967
12. New York116,320.152
13. Wisconsin115,926.208
14. Oklahoma115,560.37
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. Kentucky79,677.79
26. Oregon79,052.45
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 Virginia39,138.15
39. New Jersey38,777.837
40. Massachusetts36,930.89
41. Maryland32,669.038
42. Wyoming31,689.366
43. Maine22,862.4
44. Connecticut21,471.66
45. Alaska17,653.842
46. New Hampshire16,268.646
47. Vermont14,229.099
48. Delaware6,695.11
49. Rhode Island6,558.867
50. Hawaii4,627.55
51. District of Columbia1,518.885

Source

Organization
Federal Highway Administration
Dataset
Public road miles (computed by Understand Idaho)
Geography
States, DC
Time coverage
1900-2024
Update frequency
Annual
Published
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), built by lib/derived.ts

Caveats

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

Inputs: Highway Statistics series.

Cite

Cite this page as Understand Idaho, “Idaho public road miles”, https://understandidaho.com/transportation/road-miles/, retrieved on the date you read it, and the publisher named above for the figures themselves. The dataset behind it is described in the data catalog.

This page was last updated .