- La Canada Flintridge (Population: 20,318)
- La Crescenta-Montrose (Population: 18,532)
- La Habra (Population: 58,974)
- La Habra Heights (Population: 5,712)
- La Mesa (Population: 54,749)
- La Mirada (Population: 46,783)
- La Palma (Population: 15,408)
- La Presa (Population: 32,721)
- La Puente (Population: 41,063)
- La Quinta (Population: 23,694)
- La Riviera (Population: 10,273)
- La Verne (Population: 31,638)
- Ladera Heights (Population: 6,568)
- Lafayette (Population: 23,908)
- Laguna Beach (Population: 23,727)
- Laguna (Population: 34,309)
- Laguna Hills (Population: 31,178)
- Laguna Niguel (Population: 61,891)
- Laguna West-Lakeside (Population: 8,414)
- Laguna Woods (Population: 16,507)
- Lagunitas-Forest Knolls (Population: 1,835)
- Lake Arrowhead (Population: 8,934)
- Lake Elsinore (Population: 28,928)
- Lake Forest (Population: 58,707)
- Lake Isabella (Population: 3,315)
- Lake Los Angeles (Population: 11,523)
- Lake Nacimiento (Population: 2,176)
- Lake of the Pines (Population: 3,956)
- Lake San Marcos (Population: 4,138)
- Lake Wildwood (Population: 4,868)
- Lakeland Village (Population: 5,626)
- Lakeport (Population: 4,820)
- Lakeside (Population: 19,560)
- Lakeview (Population: 1,619)
- Lakewood (Population: 79,345)
- Lamont (Population: 13,296)
- Lancaster (Population: 118,718)
- Larkfield-Wikiup (Population: 7,479)
- Larkspur (Population: 12,014)
- Las Flores (Population: 5,625)
- Las Lomas (Population: 3,078)
- Lathrop (Population: 10,445)
- Laton (Population: 1,236)
- Lawndale (Population: 31,711)
- Laytonville (Population: 1,301)
- Le Grand (Population: 1,760)
- Lebec (Population: 1,285)
- Lemon Grove (Population: 24,918)
- Lemoore (Population: 19,712)
- Lemoore Station (Population: 5,749)
- Lennox (Population: 22,950)
- Lenwood (Population: 3,222)
- Lewiston (Population: 1,305)
- Lexington Hills (Population: 2,454)
- Lincoln (Population: 11,205)
- Lincoln Village (Population: 4,216)
- Linda (Population: 13,474)
- Linden (Population: 1,103)
- Lindsay (Population: 10,297)
- Littlerock (Population: 1,402)
- Live Oak (Population: 6,229)
- Livermore (Population: 73,345)
- Livingston (Population: 10,473)
- Lockeford (Population: 3,179)
- Lodi (Population: 56,999)
- Loma Linda (Population: 18,681)
- Loma Rica (Population: 2,075)
- Lomita (Population: 20,046)
- Lompoc (Population: 41,103)
- London (Population: 1,848)
- Lone Pine (Population: 1,655)
- Long Beach (Population: 461,522)
- Loomis (Population: 6,260)
- Los Alamitos (Population: 11,536)
- Los Alamos (Population: 1,372)
- Los Altos (Population: 27,693)
- Los Altos Hills (Population: 7,902)
- Los Angeles (Population: 3,694,820)
- Los Banos (Population: 25,869)
- Los Gatos (Population: 28,592)
- Los Molinos (Population: 1,952)
- Lost Hills (Population: 1,938)
- Lower Lake (Population: 1,755)
- Loyola (Population: 3,478)
- Lucas Valley-Marinwood (Population: 6,357)
- Lucerne (Population: 2,870)
- Lynwood (Population: 69,845)
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