Playas de Rosarito Municipality is located in the northwestern part of the
Mexican state of
Baja California comprising part of the Tijuana metropolitan area. It lies just south of the city of
Tijuana. Its municipal seat is the city of
Rosarito. According to the 2010 census, the municipality had a population of 90,668 inhabitants. Its area is 513.32 km² (198.19 sq mi).