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Interstate 15 (I-15) is the fourth-longest north–south Interstate Highway in the United States,ntraveling through the states of California, Nevada, Arizona, Utah, Idaho, and Montana from San Diego to thenCanadian border. The Idaho, Utah and Ariz...Full Wikipedia Topic
Start Terminus San Diego, California (I-8 / CA-15)
Length 2307.03 km/ 1433.52 mi
End Terminus Sweetgrass, Montana (Canada and Hwy 4)
This highway passes through multiple states. Each state is broken out sepeperatly in these listings.