Interstate 15
Route information
Length	1,433.52 mi[1] (2,307.03 km)
Existed	1957–present
NHS	Entire route
Major junctions
South end	I-8 / SR 15 in San Diego, CA
Major intersections	I-10 in Ontario, CA I-40 in Barstow, CA I-515 / US 93 / US 95 in Las Vegas, NV I-70 near Cove Fort, UT I-80 in Salt Lake City, UT I-84 from Riverdale to Tremonton, UT I-86 in Chubbuck, ID I-90 near Butte, MT
North end	Hwy 4 at Sweetgrass–Coutts Border Crossing at Sweet Grass, MT
Location
Country	United States
States	California, Nevada, Arizona, Utah, Idaho, Montana
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future

Interstate 15 is an Interstate Highway in the United States. It goes from San Diego, California north to Sweetgrass, Montana at the Canada border. It also connects the cities of Las Vegas, Nevada and Salt Lake City, Utah. The route is 1,433.52 miles (2,307.03 km) long and passes through the states of California, Nevada, Arizona, Utah, Idaho, and Montana.^[1]

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