The city of San Diego encompasses 72.7 square miles. The county of San Diego covers 4,255
square miles, comprising the city of San Diego as well as 17 incorporated cities: Carlsbad,
Chula Vista, Coronado, Del Mar, El Cajon, Encinitas, Escondido, Imperial Beach, La Mesa,
Lemon Grove, National City, Oceanside, Poway, San Marcos, Santee, Solana Beach and Vista.