- La Jolla (4,577 Companies)
- La Mesa (4,844 Companies)
- La Mirada (2,656 Companies)
- La Palma (872 Companies)
- La Puente (4,534 Companies)
- La Quinta (2,020 Companies)
- La Verne (2,131 Companies)
- Ladera Ranch (633 Companies)
- Lafayette (2,661 Companies)
- Laguna Beach (3,402 Companies)
- Laguna Hills (4,857 Companies)
- Laguna Niguel (3,411 Companies)
- Laguna Woods (435 Companies)
- Lagunitas (19 Companies)
- Lake Almanor (15 Companies)
- Lake Arrowhead (321 Companies)
- Lake Balboa (6 Companies)
- Lake City (3 Companies)
- Lake Elsinore (3,161 Companies)
- Lake Forest (5,005 Companies)
- Lake Hughes (70 Companies)
- Lake Isabella (464 Companies)
- Lake Los Angeles (11 Companies)
- Lake Sherwood (2 Companies)
- Lake Tahoe (2 Companies)
- Lake View Terrace (8 Companies)
- Lakehead (88 Companies)
- Lakeport (1,685 Companies)
- Lakeshore (2 Companies)
- Lakeside (1,397 Companies)
- Lakewood (3,541 Companies)
- Lamirada (7 Companies)
- Lamont (465 Companies)
- Lancaster (9,249 Companies)
