Mercedes is a city in Hidalgo County, Texas, United States. The population was 15,570 at the 2010 census. It is part of the McAllen–Edinburg–Mission and Reynosa–McAllen metropolitan areas.
Mercedes is located in southeastern Hidalgo County at 26°8′58″N 97°55′7″W (26.149315, -97.918675). It is bordered to the west by Weslaco and to the east, in Cameron County, by La Feria.
The Interstate 2/U.S. Route 83 freeway passes through the northern side of Mercedes, leading west 21 miles (34 km) to McAllen and east 14 miles (23 km) to Harlingen. Mercedes is 9 miles (14 km) north of the Progreso–Nuevo Progreso International Bridge over the Rio Grande, connecting Texas with the Mexican state of Tamaulipas.