[4] It is the fourth-largest municipality in the country, with a land area of 19,526.8 km2 (7,539.3 sq mi) in 2020,[5] making slightly smaller than the state of Hidalgo and larger than five other Mexican states.

Located offshore, Cedros Island and Guadalupe Island are part of the municipality, making Ensenada the westernmost municipality in Mexico and Latin America.

[6] The municipality shares borders with every other municipality in the state: Tijuana, Playas de Rosarito and Tecate to the north, Mexicali and San Felipe to the east and southeast and San Quintín to the south.

A major port is planned to be built in Punta Colonet, a largely uninhabited area 80 km (50 mi) south of the city of Ensenada.

In February 2020, San Quintín separated from Ensenada and became Baja California's sixth municipality.