Brownsville–Matamoros

Matamoros–Brownsville, also known as Brownsville–Matamoros, or simply as the Borderplex, is one of the six transborder agglomerations along the Mexico–United States border. It is part of the Lower Rio Grande Valley region. The city of Matamoros is situated in the Mexican state of Tamaulipas, on the south bank of the Rio Grande, while the city of Brownsville is located in the U.S. state of Texas, directly north across the bank of the Rio Grande. The Matamoros–Brownsville area is connected by four international bridges. In addition, this transnational conurbation area has a population of 1,136,995, making it the fourth-largest metropolitan area on the Mexico-U.S. border.

The area of Matamoros–Brownsville lies among the top-10 fastest-growing urban areas in the United States. The Brownsville–Harlingen and the Brownsville–Harlingen–Raymondville metropolitan areas are included in the official countdown of this transnational conurbation.

Municipalities/counties

 * Matamoros Municipality, Tamaulipas
 * Cameron County, Texas
 * Willacy County, Texas

Communities
Note: Principal cities are bolded.

Cities in Mexico

 * Matamoros, Tamaulipas

Populated places
Note: Within the municipality of Matamoros.
 * Control
 * Estación Ramírez
 * Buena Vista
 * Las Rusias
 * Santa Adelaida
 * La Gloria
 * Sandoval
 * México Agrario
 * 20 de Noviembre
 * Ignacio Zaragoza
 * Unión

Villages

 * Over 468 municipal villages.

Cities in the United States

 * Brownsville
 * Harlingen
 * La Feria
 * Los Fresnos
 * Lyford
 * Palm Valley
 * Port Isabel
 * Raymondville
 * Rio Hondo
 * San Benito
 * San Perlita

Towns

 * Bayview
 * Combes
 * Indian Lake
 * Laguna Vista
 * Los Indios
 * Primera
 * Rancho Viejo
 * Santa Rosa
 * South Padre Island

Villages

 * Rangerville