Gladewater is a city in Gregg and Upshur counties in the U.S. state of Texas. The population was 6,441 at the 2010 census. U.S. Route 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 "I 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.
Gladewater was founded by the Texas and Pacific Railway Company in 1873 on land bought from Jarrett Dean and Anderson White. A community called St. Clair, 2 miles (3 km) to the east, moved to Gladewater when the railroad announced that the only mail stop in the area would be there; residents from Point Pleasant, also bypassed by the railroad, moved to Gladewater. The first post office at Gladewater was established on August 22, 1873.