Brownsville (/ˈbraʊnzvɪl/ BROWNZ-vil) is a city in the U.S. state of Texas and the county seat of Cameron County, located on the western Gulf Coast in South Texas, adjacent to the border with Matamoros, Tamaulipas, Mexico. The city covers 145.2 sq mi (376.066 km), and had a population of 186,738 at the 2020 census. As of the 2020 U.S. census, it is the 136th-most populous city in the United States and 18th-most populous in Texas. It is part of the Matamoros–Brownsville metropolitan area. The city is known for its year-round subtropical climate, deep-water seaport, and Hispanic culture.
The city was founded in 1848 by American entrepreneur Charles Stillman after he developed a successful river-boat company nearby. It was named for Fort Brown, itself named after Major Jacob Brown, who fought and died while serving as a U.S. Army soldier during the Mexican–American War (1846–1848). As a county seat, the city and county governments are major employers. Other primary employers fall within the service, trade, and manufacturing industries, including a growing aerospace and space transportation sector. It operates international trading through the Port of Brownsville. The city experienced a population increase in the early 1900s, when steel production flourished.