There are many parts of the City of Los Angeles that are commonly mistaken to be separate cities. If you pay electricity to "DWP", you are in the City of Los Angeles. The "communities" within Los Angeles are listed at left and shown with their name in BLACK type in this map, where the names of cities other than Los Angeles are shown in RED. 

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Adams
Arleta
Atwater Village
Barnes City
Bel Air
Benedict-Coldwater 
Beverly Glen
Boyle Heights
Brentwood
Canoga Park
Central Avenue
Chatsworth
Chinatown
Crenshaw
Downtown LA 
Eagle Rock
Echo Park
El Sereno
Encino
Expo Park
Glassell Park
Granada Hills
Green Meadows
Hancock Park
Harbor City
Highland Park
Hollywood
Koreatown
La Brea
Lake Balboa
Lakeview Terrace
Lincoln Heights
Little Tokyo
Los Feliz
Mar Vista
Miracle Mile
Mission Hills
Mount Olympus
North Hills
North Hollywood
North Shoestring
Northridge
Pacific Palisades
Pacoima
Palms
Panorama City
Park La Brea
Playa del Rey
Porter Ranch
Rancho Park
Reseda
San Pedro
Sawtelle
Sepulveda
Sherman Oaks
Silverlake
South Park
South Vermont
Studio City
Sunland
Sun Valley
Sylmar
Tarzana
Toluca Lake
Tujunga
Valley Glen 

The Big Confusion

There is no such city as "Encino", "Van Nuys," "Hollywood," or "San Pedro." They are all parts of the city of Los Angeles, all under the same laws. A few areas like Beverly Hills, West Hollywood, San Fernando, Culver City and Santa Monica are surrounded by Los Angeles, but they are separate cities.