U.S. Route 277 is a north–south United States Highway that is a spur route of U.S. Route 77. It no longer connects to its parent route, US 77, although it does intersect another one of its spur. It runs for 633 miles (1,019 km) across Oklahoma and Texas. US 277's northern terminus is in Newcastle, Oklahoma at Interstate 44, which is also the northern terminus of the H.E. Bailey Turnpike. Its southern terminus is in Carrizo Springs, Texas at U.S. Route 83. It passes through the states of Oklahoma and Texas.

U.S. Route 77 is a major north–south United States Numbered Highway which extends for 1,305 miles (2,100 km) in the central United States. As of 2005, Its southern terminus is in Brownsville, Texas, at Veteran's International Bridge on the Mexican border, where it connects with both Mexican Federal Highway 101 and Mexican Federal Highway 180, and the highway's northern terminus is in Sioux City, Iowa, at an interchange with Interstate 29 (I-29), less than 1⁄2 mile (800 m) north of the Nebraska state line.