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Driving Mileage from: Yellowstone Park South Entrance 171 Jackson, WY 174  Salt Lake City, UT 296 Denver, CO 363 Billings, MT 283 Casper, WY 147  Cheyenne, WY 269

From Denver
Take I-25 north from Denver to Fort Collins, then U.S. Highway 287 to Laramie. From there, follow I-80 west to Rawlins, where highways 287/789 and 135 lead directly into Wind River Country.

From Casper
From Casper, take U.S. Highway 20/26 west to Shoshoni and continue on 26/789 to more of Wind River Country.