Interstate 15

Interstate 15 marker Interstate 15
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Route information
Length	1,433.52 mi (2,307.03 km)
Existed	1957–present
NHS	Entire route
Major junctions
South end	File:I-8 (1961).svgFile:California 15.svg I-8 / SR 15 in San Diego, CA
Major intersections	File:I-10.svg I-10 in Ontario, CA File:I-40.svg I-40 in Barstow, CA File:I-515.svgFile:US 93.svgFile:US 95.svg I-515 / US 93 / US 95 in Las Vegas, NV File:I-70.svg I-70 near Cove Fort, UT File:I-80.svg I-80 in Salt Lake City, UT File:I-84.svg I-84 from Riverdale to Tremonton, UT File:I-86.svg I-86 in Chubbuck, ID File:I-90.svg I-90 near Butte, MT
North end	File:Alberta Highway 4.svg 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.