Interstate 15

How long is I-15?

I-15 is the 11th longest interstate at approximately 1,433 miles in length.


Like its close neighbor I-5, it stretches across the United States from north to south. It ends at the Canadian border and stops just shy of the Mexican border.

Where does I-15 end?

I-15's southern end is about 10 miles north of the Mexican border, where it junctures with I-5 in San Diego. Its northern terminus is in the remote and unincorporated town of Sweet Grass, Montana, on the Canadian border.

Map of I-15


Attractions near I-15:

I-15 is a wonderful road to see beautiful open landscapes, gorgeous mountain views and vast canyons. There are also a great deal of things to see and do while traveling this highway, some of which are listed below:

  • Cathedral of St. Helena
    Helena, MT
  • Yellowstone Park
    Idaho Falls, ID
  • Museum of Fine Arts
    Salt Lake City, UT
  • Park City
    Salt Lake City, UT
  • Liberty Park & Tracy Aviary
    Salt Lake City, UT
  • Hoover Dam
    Las Vegas, NV
  • Las Vegas Boulevard (Las Vegas Strip)
    Las Vegas, NV
  • The Mob Museum
    Las Vegas, NV
  • Disneyland
    Anaheim, CA
  • Beaches of Southern California
    Del Mar, CA
  • San Diego Zoo
    San Diego, CA
  • La Jolla Beach and Cove
    La Jolla, CA

States I-15 travels through

I-15 goes through 6 different states. It barely clips portions of Nevada and Arizona, and travels the entire states of Montana and Utah. They are listed below from north to south:

  • Montana
  • Idaho
  • Utah
  • Arizona
  • Nevada
  • California

I-15 Major Cities

I-15 travels on the western edge of the Rocky Mountain Chain and into the desert areas of the southwest. On its journey, it passes through a number of exciting places. Below are five of the largest cities it travels to.

  • Helena, Montana
  • Salt Lake City, Utah
  • Las Vegas, Nevada
  • Los Angeles, California
  • San Diego, California

Major Connections & Interchanges

  • Butte, MT
    I-90 W to Spokane, WA
    I-90 E to Bismarck, ND
  • Salt Lake City, ID
    I-80 W to Sacramento, CA
    I-80 E to Cheyenne, WY
  • Cove Fort, UT
    I-70 E to Denver, CO
  • Barstow, CA
    I-40 E to Albequerque, NM
  • San Bernadino, CA
    I-10 W to Los Angeles, LA
    I-10 E to Phoenix, AZ
  • San Diego, CA
    I-8 E to Tuscon, AZ
    I-8 W to Downtown San Diego, CA
    I-5 N to Los Angeles, CA
    I-5 S to Mexico