- La Jolla (4,581 Companies)
- La Mesa (4,847 Companies)
- La Mirada (2,657 Companies)
- La Palma (873 Companies)
- La Puente (4,541 Companies)
- La Quinta (2,021 Companies)
- La Verne (2,137 Companies)
- Ladera Ranch (634 Companies)
- Lafayette (2,663 Companies)
- Laguna Beach (3,406 Companies)
- Laguna Hills (4,866 Companies)
- Laguna Niguel (3,414 Companies)
- Laguna Woods (435 Companies)
- Lagunitas (19 Companies)
- Lake Almanor (15 Companies)
- Lake Arrowhead (322 Companies)
- Lake Balboa (6 Companies)
- Lake City (3 Companies)
- Lake Elsinore (3,166 Companies)
- Lake Forest (5,012 Companies)
- Lake Hughes (70 Companies)
- Lake Isabella (465 Companies)
- Lake Los Angeles (11 Companies)
- Lake Sherwood (2 Companies)
- Lake Tahoe (2 Companies)
- Lake View Terrace (8 Companies)
- Lakehead (88 Companies)
- Lakeport (1,688 Companies)
- Lakeshore (2 Companies)
- Lakeside (1,399 Companies)
- Lakewood (3,542 Companies)
- Lamirada (7 Companies)
- Lamont (465 Companies)
- Lancaster (9,261 Companies)
