1. Ibex Hills - Inyo County
2. Indio Hills - Coachella Valley (Colorado Desert east of Indio)
3. In-Ko-Pah Mountains - near Manzanita Indian Reservation (north of I-8)
4. Inyo Mountains - east of Owens Lake
5. Irish Hills - San Luis Obispo & Los Osos
6. Iron Mountains - San Bernardino County
7. Ivanpah Mountains - southeastern Mojave Desert

1. Jacalitos Hills - western Fresno County
2. Jacumba Mountains - eastern San Diego County
3. Jamul Mountains - southernmost San Diego County
4. Jurupa Mountains (Hills) - southeastern Pomona Valley

1. Kalmia Hills - Riverside County (north of Moreno Valley city)
2. Kelsey Range - Siskiyou County
3. Kelso Mountains - Mojave Desert (SE of Baker)
4. Kettleman Hills - west Kings County
5. Kilbeck Hills - eastern Mojave Desert
6. Kilgore Hills - Siskiyou County
7. King Range - Humboldt County
8. Kingston Range - Mojave Desert (north of Halloran Springs)
9. Kit Fox Hills - Inyo County
10. Klamath Mountains - western California & Oregon
11. Kramer Hills - Mojave Desert (SE of Boron)
12. Kreyenhagen Hills - eastern foothills of the Diablo Range (Fresno & Kings Counties)