Cameron County, Texas

Cameron County is the southernmost county in the U.S. state of Texas. As of the 2025 census estimate, its population was 433,946. Its county seat and largest city is Brownsville, with the second-largest being Harlingen. The county was founded in 1848 and is named for Ewen Cameron, a Captain during the Texas Revolution and in the ill-fated Mier Expedition. During the later 19th century and through World War II, Fort Brown was a US Army outpost here, stimulating the development of the city of Brownsville. Cameron County comprises the Brownsville–Harlingen metropolitan area, as well as the Brownsville-Harlingen-Raymondville combined statistical area, which itself is part of the larger Rio Grande Valley region. The county is home to the SpaceX Starbase spaceport, situated in Boca Chica; it is also the residence of Elon Musk.