Technically, none- since the term Interstate means a road that goes to other states- and since Hawai'i is a group of islands, no roads go out of Hawai'i. It is several thousand miles to another state. But there are 4 expressways on the Island of Oahu that are designated H-1 thru H-4, they were funded by the Interstate Highway program.
4 Highways are in Hawaii.
Maui is in Hawaii, an island, not accessible by road. However, Hawaii does have two interstate highways. Hmmm....
Auxiliary Interstate Highways and Primary Interstate Highways
H-1, H-2, H-3 and H-201.
Utah and Missouri. Actually, there are 5 Interstate highways in Utah and 17 in Missouri. The only state without any Interstate highways is Alaska.
There are 67 Interstate Highways in the US.
There are many highways throughout California. Interstate 5 and 80 are the major highways in the state. Both highways run through the capital of Sacramento.
The major highways are highway 50 highway 99 and highway 101 As well as Interstate 5, Interstate 40, Interstate 15, Interstate 8, and Interstate 80.
Interstate highways
Interstate highways are identified on signs with a shield-shaped design. This distinctive shield shape makes it easy for drivers to recognize and navigate interstate highways across the United States.
Three Interstate Highways transect Washington State. These include Interstate 82, Interstate 90, and Interstate 5. Interstate 90 crosses the entire state at a length of 297.52 miles.
Interstate Highways 95 and 295 and US Highway 1.