Interstate 25 in Wyoming

Interstate 25
I-25 highlighted in red
Route information
Maintained by WYDOT
Length	300.530 mi[1] (483.656 km)
Existed	1964–present
NHS	Entire route
Major junctions
South end	I-25 / US 87 at the Colorado state line near Cheyenne
Major intersections	I-80 in Cheyenne US 30 in Cheyenne US 85 near Cheyenne US 18 / US 20 in Orin US 20 / US 26 in Casper US 16 in Buffalo
North end	I-90 / US 87 near Buffalo
Location
Country	United States
State	Wyoming
Counties	Laramie, Platte, Converse, Natrona, Johnson
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Wyoming State Highway System Interstate US State
← WYO 24 → US 26

Interstate 25 (I-25) is a part of the Interstate Highway System that runs from Las Cruces, New Mexico, to Buffalo, Wyoming. In Wyoming, the Interstate Highway runs 300.530 miles (483.656 km) from the Colorado state line near Cheyenne north to its national terminus at I-90 near Buffalo. I-25 connects Wyoming's largest city and capital, Cheyenne, with its second largest city, Casper, and the smaller communities of Wheatland, Douglas, and Buffalo. The highway also connects those cities with Denver and Billings via I-90. I-25 runs concurrently with U.S. Route 87 (US 87) for almost its entire course in Wyoming. The highway also has extensive concurrencies with US 20 and US 26 along its east–west segment through the North Platte River valley. The Interstate has business loops through Cheyenne, Chugwater, Wheatland, Douglas, Glenrock, Casper, and Buffalo.