Brownsville is a city in Cameron County in the U.S. state of Texas. It is located on the western Gulf Coast in South Texas, adjacent to the border with Matamoros, Mexico. The city covers 81.528 sqmi and has a population of 183,392 as of 2018. It is the 131st-largest city in the United States and 16th-largest in Texas. It is part of the Brownsville–Matamoros conurbation. The city is known for its year-round subtropical climate, deep-water seaport and Hispanic culture.