State Highway 3, also abbreviated as SH-3 or OK-3, is a highway maintained by the U.S.

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 state of Oklahoma

Oklahoma

Oklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...

. Traveling diagonally through Oklahoma, from the Panhandle to the far southeastern corner of the state, SH-3 is the longest state highway in the Oklahoma road system, at a total length of 616.5 mi (992 km) via SH-3E (see below).
Highway 3 begins at the Colorado state line 19 mi (31 km) north of Boise City

Boise City, Oklahoma

Boise City is a city in and the county seat of Cimarron County, Oklahoma, United States. The population was 1,266 at the 2010 census.'Boise' rhymes with 'voice'...

, Oklahoma

Oklahoma

Oklahoma is a state located in the South Central region of the United States of America. With an estimated 3,751,351 residents as of the 2010 census and a land area of 68,667 square miles , Oklahoma is the 28th most populous and 20th-largest state...

.