List of state highways in Hawaii
The Hawaii Department of Transportation maintains the smallest state-maintained system of state highways in the country. It consists of Interstates, state highways, and secondary state highways, totaling approximately.
Primary and auxiliary interstates
Primary and secondary routes
The current state highway numbering system was established in 1955. Route numbers are organized so that the initial digit corresponds to the island:- Numbers beginning with 1 or 2: Hawaii
- Numbers beginning with 3: Maui
- Numbers beginning with 4: Molokai, Lanai
- Numbers beginning with 5: Kauai
- Numbers beginning with 6 to 9: Oahu
When referring to highways, Hawai'i residents usually refer to state highways by their names instead of their route numbers.
Temporary Federal routes
During World War II, a temporary Federal route numbering system was setup on the island of Oahu. They were used to assist military personnel not accustomed to the Hawaiian street names during the time of Martial law in the Territory of Hawaii from 1941 to 1945. Though marked with U.S. Route shields, they were never part of the United States Numbered Highway System.| Number | Length | Length | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes |
| Route 1 | — | — | Route 2 / Route 13 in Honolulu | Route 2 / Route 223 near Waialua | 1941 | 1945 | South Vineyard Boulevard » Wai‘alae Avenue » Kalaniana‘ole Highway » Kailua Road » Oneawa Street » Mōkapu Boulevard » Kāne‘ohe Bay Drive » Kamehameha Highway |
| Route 2 | — | — | Route 1 / Route 13 in Honolulu | Route 1 / Route 223 near Waialua | 1941 | 1945 | Nimitz Highway » Kamehameha Highway |
| Route 13 | — | — | Route 1 / Route 2 in Honolulu | Route 1 in Kailua | 1941 | 1945 | Bishop Street » Pali Highway |
| Route 220 | — | — | Route 223 in Nānākuli | Route 2 in Pearl City | 1941 | 1945 | Farrington Highway |
| Route 223 | — | — | Route 220 in Nānākuli | Route 1 / Route 2 near Waialua | 1941 | 1945 | Farrington Highway |
| Route 230 | — | — | Route 1 in Kāneohe | Route 1 in Kailua | 1941 | 1945 | Kailua Road » Oneawa Street » Mōkapu Boulevard » Kāne‘ohe Bay Drive |