Interstate 25 (I-25) is a major Interstate Highway in the western United States. It is primarily a north–south highway. I-25 stretches from Interstate 10 at Las Cruces, New Mexico (approximately 25 miles (40 km) north of El Paso, Texas), to Interstate 90 in Buffalo, Wyoming (approximately 60 miles (97 km) south of the Montana/Wyoming border).Interstate 25 is the main north–south expressway through Wyoming, Colorado, and New Mexico.