- Island Grissom
- Island Mountain
- Island Number One
- Island Number One
- Island Number One (historical)
- Island Number Two
- Island of Saint James
- Island White
- Italian Swiss Colony
- Ivanpah
- Iverson Indian Rancheria
- Ivesta
- Ivory
- Ivy del Mobile Home Park
- Independence
- Imperial
- Indian Wells
- Inverness
- Imperial Beach
- Indian Falls
- Indian Wells
- Indio
- Industry
- Inglewood
- Interlaken
- Inyokern
- Ione
- Iron Horse
- Irvine
- Irwindale