Brownsville is a city in and the county seat of Cameron County, Texas, United States. Brownsville is the 15th largest city in the state of Texas and the 130th largest in the United States. The 2000 United States Census population was 139,722, with a July 1, 2007 Census estimate of 172,806; which reflects growth rate of 23.7 percent. Brownsville is also the southernmost city in Texas.

Brownsville is the principal city of the Brownsville–Harlingen Metropolitan Statistical Area, which is part of the larger Brownsville, Harlingen, Raymondville Combined Statistical Area.