Mexicali Municipality is a municipality (municipio) in the Mexican state of Baja California. Its municipal seat (cabecera municipal) is located in the city of Mexicali. As of 2020, the municipality had a total population of 1,049,792. The municipality has an area of 13700 km2. This includes many smaller outlying communities as well as the city of Mexicali. Also, the islands of Baja California located in the Gulf of California are part of the municipality, among them the mudflat islands at the mouth of the Colorado River (the largest one being Montague Island), Isla Ángel de la Guarda and the islands of the San Lorenzo Marine Archipelago National Park. Mexicali is the northernmost municipality of Latin America.
The city of Mexicali was founded in 1903, and its name is a portmanteau of Mexico and California, as is the name of Calexico, California across the border.
Mexicali has more than 180 maquiladoras, and the rapid growth of the city has outstripped the capacity of its sewage system.
