List of places in California (K)
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| Name of place | Number of counties | Principal county | Lower zip code | Upper zip code |
| Kadota | 1 | Merced County | ||
| Kagel Canyon | 1 | Los Angeles County | 91342 | |
| Kaiser | 1 | San Bernardino County | ||
| Kaiser Center | 1 | Alameda County | 94612 | |
| Kaiser's Eagle Mountain | 1 | Riverside County | 92241 | |
| Kalina | 1 | Modoc County | ||
| Kamondorski | 1 | Alameda County | ||
| Kamp Klamath | 1 | Del Norte County | 95548 | |
| Kanawyers | 1 | Fresno County | ||
| Kandra | 1 | Modoc County | ||
| Kane Spring | 1 | Imperial County | ||
| Karlo | 1 | Lassen County | ||
| Karnak | 1 | Sutter County | 95645 | |
| Karuk Reservation | 2 | Humboldt County | ||
| Karuk Reservation | 2 | Siskiyou County | ||
| Kathryn | 1 | Orange County | ||
| Kaweah | 1 | Tulare County | 93237 | |
| Kayandee | 1 | Kern County | ||
| Kearney | 1 | Los Angeles County | ||
| Kearsarge | 1 | Inyo County | ||
| Keddie | 1 | Plumas County | 95952 | |
| Keefer | 1 | Butte County | ||
| Keeler | 1 | Inyo County | 93530 | |
| Keenbrook | 1 | San Bernardino County | ||
| Keene | 1 | Kern County | 93531 | |
| Keene Summit | 1 | Mendocino County | 95427 | |
| Kegg | 1 | Siskiyou County | ||
| Keith | 1 | Ventura County | ||
| Kekawaka | 1 | Trinity County | ||
| Kellog | 1 | Sonoma County | 94515 | |
| Kelsey | 1 | El Dorado County | 95643 | |
| Kelseyville | 1 | Lake County | 95451 | |
| Kelso | 1 | San Bernardino County | 92351 | |
| Kennedy | 1 | San Joaquin County | ||
| Kennedy Meadow | 1 | Tuolumne County | 95370 | |
| Kenny | 1 | Mendocino County | ||
| Kensington | 1 | Contra Costa County | 94707 | |
| Kensington Park | 1 | San Diego County | ||
| Kentfield | 1 | Marin County | 94904 | |
| Kenton Mill | 1 | San Bernardino County | ||
| Kentucky House | 1 | Calaveras County | ||
| Kentwood-In-The-Pines | 1 | San Diego County | ||
| Kent Woodlands | 1 | Marin County | 94904 | |
| Kenwood | 1 | Sonoma County | 95452 | |
| Keough Hot Springs | 1 | Inyo County | 93514 | |
| Kephart | 1 | Modoc County | ||
| Kerens | 1 | San Bernardino County | ||
| Kerlinger | 1 | San Joaquin County | ||
| Kerman | 1 | Fresno County | 93630 | |
| Kern City | 1 | Kern County | ||
| Kernell | 1 | Kern County | ||
| Kern Homes | 1 | Kern County | 93306 | |
| Kern Junction | 1 | Kern County | ||
| Kern Lake | 1 | Kern County | ||
| Kernvale | 1 | Kern County | 93240 | |
| Kernville | 1 | Kern County | 93238 | |
| Kester | 1 | Los Angeles County | 91405 | |
| Keswick | 1 | Shasta County | 96001 | |
| Kett | 1 | Shasta County | ||
| Kettenpom | 1 | Trinity County | ||
| Kettleman | 1 | San Joaquin County | ||
| Kettleman City | 1 | Kings County | 93239 | |
| Kettleman Station | 1 | Kings County | ||
| Kevet | 1 | Ventura County | ||
| Keyes | 1 | Stanislaus County | 95328 | |
| Keyesville | 1 | Kern County | ||
| Keystone | 1 | Los Angeles County | ||
| Keystone | 1 | Tuolumne County | 95327 | |
| Kibesillah | 1 | Mendocino County | ||
| Kiesel | 1 | Yolo County | ||
| Kilaga Springs | 1 | Placer County | ||
| Kilkare Woods | 1 | Alameda County | 94586 | |
| Kilowatt | 1 | Kern County | ||
| Kimball | 1 | Ventura County | ||
| Kincaid | 1 | Los Angeles County | ||
| King | 1 | Orange County | 92706 | |
| King City | 1 | Monterey County | 93930 | |
| Kingdon | 1 | San Joaquin County | ||
| King Farms | 1 | Yolo County | ||
| King Salmon | 1 | Humboldt County | ||
| Kings Beach | 1 | Placer County | 96143 | |
| Kingsburg | 1 | Fresno County | 93631 | |
| Kings Canyon National Park | 2 | Fresno County | 93633 | |
| Kings Canyon National Park | 2 | Tulare County | 93633 | |
| Kings Park | 1 | Kings County | ||
| Kingsville | 1 | El Dorado County | ||
| Kingvale | 1 | Nevada County | 95728 | |
| Kinneloa Mesa | 1 | Los Angeles County | 99107 | |
| Kinyon | 1 | Siskiyou County | ||
| Kirkville | 1 | Sutter County | 95645 | |
| Kirkwood | 1 | Alpine County | 95646 | |
| Kirkwood | 1 | Glenn County | ||
| Kirkwood | 1 | Tehama County | 96021 | |
| Kiska | 1 | Tehama County | ||
| Kismet | 1 | Madera County | ||
| Kister | 1 | Butte County | ||
| Kit Carson | 1 | Amador County | 95644 | |
| Kiva Beach | 1 | El Dorado County | ||
| Klamath | 1 | Del Norte County | 95548 | |
| Klamath Air Force Station | 1 | Del Norte County | 95548 | |
| Klamath Glen | 1 | Del Norte County | 95548 | |
| Klamath River | 1 | Siskiyou County | 96050 | |
| Klau | 1 | San Luis Obispo County | 93446 | |
| Klinefelter | 1 | San Bernardino County | ||
| Klondike | 1 | San Bernardino County | ||
| Kneeland | 1 | Humboldt County | 95549 | |
| Knightsen | 1 | Contra Costa County | 94548 | |
| Knights Ferry | 1 | Stanislaus County | 95361 | |
| Knights Landing | 1 | Yolo County | 95645 | |
| Knob | 1 | Shasta County | 96001 | |
| Knowles | 1 | Madera County | 93653 | |
| Knowles Corner | 1 | Sonoma County | ||
| Knowles Junction | 1 | Madera County | ||
| Knoxville | 1 | Napa County | ||
| Kohler | 1 | Alameda County | ||
| Komandorski Village | 1 | Alameda County | 94568 | |
| Korbel | 1 | Humboldt County | 95550 | |
| Korbel | 1 | Sonoma County | ||
| Korblex | 1 | Humboldt County | ||
| Kramer Hills | 1 | San Bernardino County | ||
| Kramer Junction | 1 | San Bernardino County | 93516 | |
| Kramm | 1 | Butte County | ||
| Krug | 1 | Napa County | 94574 | |
| Kyburz | 1 | El Dorado County | 95720 |