According to the United States Census Bureau the city has a total area of 12.1square miles (31.4Square kilometers), of which 11.6square miles (30.1Square kilometers) is land and 0.5square miles (1.4Square kilometers) (4.37%) is water. Gladewater is a city in Gregg and Upshur Counties in the U.S. state of Texas. The population was 6,228 at the 2010 census. U.S. Highway 80 traverses the city. The town is probably most famous as a base during Elvis Presley's Early career , and also as the town in which Johnny Cash wrote Walk the Line. In the early 20th century, Gladewater was an oil boom town. Gladewater is known as the "Antique Capital of East Texas" with its Main Street downtown antique district.