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Interstate 15 (I-15) is a major Interstate Highway in the western United States, running through Southern California and the Intermountain West. I-15 begins near the Mexico\US border in San Diego County and stretches north to Alberta, Canada, passing through the states of California, Nevada, Arizona, Utah, Idaho, and Montana. The Interstate serves the cities of San Diego, Las Vegas, Salt Lake City, Idaho Falls, and Great Falls. It also passes close to the urban areas of Orange County and Los Angeles County, California. The stretches of I-15 in Idaho, Utah, and Arizona have been designated as the \...Full Wikipedia Topic
This highway passes through multiple states or provinces. Each is broken out sepeperatly in these listings.