| Name of place | Number of counties | Principal county | Lower zip code | Upper zip code |
|---|
| Fagan | 1 | Butte County | | |
| Fairbanks | 1 | El Dorado County | | |
| Fairbanks Ranch | 1 | San Diego County | | |
| Fairchild | 1 | San Joaquin County | | |
| Fairfax | 1 | Marin County | 94930 | |
| Fairfield | 1 | Solano County | 94533 | |
| Fairhaven | 1 | Humboldt County | 95564 | |
| Fairmead | 1 | Madera County | 93610 | |
| Fairmont | 1 | Los Angeles County | 93534 | |
| Fairmont Hospital | 1 | Alameda County | 94578 | |
| Fairmont Terrace | 1 | Alameda County | 94577 | |
| Fairmount | 1 | Contra Costa County | 94530 | |
| Fairmount Avenue | 1 | Contra Costa County | | |
| Fair Oaks | 1 | Sacramento County | 95628 | |
| Fair Oaks | 1 | San Joaquin County | | |
| Fair Oaks | 1 | San Luis Obispo County | 93420 | |
| Fair Oaks Ranch | 1 | Los Angeles County | 91387 | |
| Fair Play | 1 | El Dorado County | | |
| Fairview | 1 | Alameda County | 94542 | |
| Fairview | 1 | Fresno County | 93657 | |
| Fairview | 1 | Orange County | 92626 | |
| Fairview | 1 | Stanislaus County | 95350 | |
| Fairview | 1 | Tulare County | 93238 | |
| Fairview | 1 | Ventura County | | |
| Fairville | 1 | Sonoma County | | |
| Fairway Park | 1 | Alameda County | | |
| Fales Hot Springs | 1 | Mono County | | |
| Falk | 1 | Humboldt County | 95501 | |
| Fallbrook | 1 | San Diego County | 92028 | |
| Fallbrook Junction | 1 | San Diego County | 92055 | |
| Fallen Leaf | 1 | El Dorado County | 96151 | |
| Falling Springs | 1 | Los Angeles County | | |
| Fallon | 1 | Marin County | 94952 | |
| Fall River Mills | 1 | Shasta County | 96028 | |
| Fallrock Junction | 1 | San Diego County | | |
| Fallsvale | 1 | San Bernardino County | 92339 | |
| Famoso | 1 | Kern County | | |
| Fancher | 1 | Fresno County | 93702 | |
| Fane | 1 | Tulare County | | |
| Farley | 1 | Mendocino County | | |
| Farmers Market | 1 | Los Angeles County | 90036 | |
| Farmersville | 1 | Tulare County | 93223 | |
| Farmington | 1 | San Joaquin County | 95230 | |
| Farr | 1 | San Diego County | | |
| Farwell | 1 | Alameda County | | |
| Fawnskin | 1 | San Bernardino County | 92333 | |
| Fayette | 1 | Tulare County | | |
| Feather Falls | 1 | Butte County | 95940 | |
| Feather River Inn | 1 | Plumas County | 96103 | |
| Feather River Park | 1 | Plumas County | | |
| Federal | 1 | Los Angeles County | 90012 | |
| Federal | 1 | Los Angeles County | 90053 | |
| Federal | 1 | Orange County | 92805 | |
| Federal Building | 1 | San Francisco County | 94102 | |
| Federal Building | 1 | Ventura County | 93030 | |
| Federal Terrace | 1 | Solano County | 94590 | |
| Felicity | 1 | Imperial County | 92283 | |
| Felix | 1 | Calaveras County | | |
| Fellows | 1 | Kern County | 93224 | |
| Felton | 1 | Santa Cruz County | 95018 | |
| Felton Grove | 1 | Santa Cruz County | 95018 | |
| Femmons | 1 | Tuolumne County | | |
| Fenner | 1 | San Bernardino County | | |
| Fergus | 1 | Merced County | | |
| Fern | 1 | Shasta County | | |
| Fern Ann Falls | 1 | Los Angeles County | | |
| Fernbridge | 1 | Humboldt County | 95540 | |
| Fernbrook | 1 | San Diego County | 92065 | |
| Ferndale | 1 | Humboldt County | 95536 | |
| Fern Valley | 1 | Riverside County | 92349 | |
| Fernwood | 1 | Humboldt County | | |
| Fernwood | 1 | Los Angeles County | 90290 | |
| Ferrum | 1 | Riverside County | | |
| Fetters Hot Springs | 1 | Sonoma County | 95416 | |
| Fetters Hot Springs-Agua Caliente | 1 | Sonoma County | | |
| Fiddlers Green | 1 | Glenn County | | |
| Fiddletown | 1 | Amador County | 95629 | |
| Field | 1 | San Bernardino County | | |
| Fieldbrook | 1 | Humboldt County | 95521 | |
| Fields Landing | 1 | Humboldt County | 95537 | |
| Figarden | 1 | Fresno County | | |
| Fig Garden | 1 | Fresno County | 93704 | |
| Fig Garden Village | 1 | Fresno County | 93704 | |
| Fig Orchard | 1 | Kern County | | |
| Figueroa | 1 | Los Angeles County | 91001 | |
| Fillmore | 1 | Ventura County | 93015 | |
| Fingal | 1 | Riverside County | | |
| Finley | 1 | Lake County | 95435 | |
| Firebaugh | 1 | Fresno County | 93622 | |
| Firebrick | 1 | Amador County | | |
| Fire Mountain | 1 | Tehama County | 96063 | |
| Firestone | 1 | Los Angeles County | 90280 | |
| Firestone Park | 1 | Los Angeles County | 90001 | |
| First Street | 1 | San Diego County | 92054 | |
| Fish Camp | 1 | Mariposa County | 93623 | |
| Fishel | 1 | San Bernardino County | | |
| Fisher | 1 | Humboldt County | | |
| Fisher | 1 | Shasta County | | |
| Fish Rock | 1 | Mendocino County | | |
| Fish Springs | 1 | Inyo County | | |
| Fisk | 1 | San Francisco County | 94122 | |
| Fitchburg | 1 | Alameda County | 94621 | |
| Five Brooks | 1 | Marin County | 94950 | |
| Five Corners | 1 | San Joaquin County | 95336 | |
| Five Mile Terrace | 1 | El Dorado County | 95667 | |
| Five Points | 1 | Fresno County | 93624 | |
| Five Points | 1 | Kern County | | |
| Five Points | 1 | Los Angeles County | | |
| Five Points | 1 | Plumas County | | |
| Five Points | 1 | San Diego County | | |
| Five Points | 1 | Solano County | | |
| Flamingo Heights | 1 | San Bernardino County | | |
| Fleet ASW Training Center, PAC | 1 | San Diego County | 92147 | |
| Fleet Combat Training Center | 1 | San Diego County | 92147 | |
| Fleetridge | 1 | San Diego County | | |
| Fleta | 1 | Kern County | | |
| Fletcher | 1 | Modoc County | | |
| Flinn Springs | 1 | San Diego County | 92021 | |
| Flint | 1 | Los Angeles County | 90057 | |
| Flintridge | 1 | Los Angeles County | 91011 | |
| Flonellis | 1 | El Dorado County | | |
| Florence | 1 | Los Angeles County | 90001 | |
| Florence-Graham | 1 | Los Angeles County | | |
| Florida Vallevista | 1 | Riverside County | | |
| Florin | 1 | Sacramento County | 95828 | |
| Florin Road | 1 | Sacramento County | | |
| Floriston | 1 | Nevada County | 96111 | |
| Flosden | 1 | Solano County | | |
| Flosden Acres | 1 | Solano County | 94590 | |
| Flournoy | 1 | Tehama County | 96029 | |
| Flower Village | 1 | Kern County | 93305 | |
| Floyd | 1 | Fresno County | | |
| Fluhr | 1 | Merced County | | |
| Flumeville | 1 | Mendocino County | | |
| Fly In Acres | 1 | Calaveras County | 95223 | |
| Flynn | 1 | San Bernardino County | | |
| Folsom | 1 | Sacramento County | 95630 | |
| Folsom Junction | 1 | Sacramento County | 95630 | |
| Folsom State Prison | 1 | Sacramento County | | |
| Fondo | 1 | Imperial County | | |
| Fontana | 1 | San Bernardino County | 92335 | |
| Foothill | 1 | Los Angeles County | | |
| Foothill | 1 | Placer County | | |
| Foothill Farms | 1 | Sacramento County | 95841 | |
| Foothill Ranch | 1 | Orange County | 92610 | |
| Foppiano | 1 | San Joaquin County | | |
| Forbestown | 1 | Butte County | 95941 | |
| Ford City | 1 | Kern County | 93268 | |
| Forebay | 1 | Placer County | | |
| Forest | 1 | Sierra County | 95910 | |
| Foresta | 1 | Mariposa County | 95389 | |
| Forest Falls | 1 | San Bernardino County | 92339 | |
| Forest Glen | 1 | Trinity County | 96030 | |
| Foresthill | 1 | Placer County | 95631 | |
| Forest Hills | 1 | Sonoma County | | |
| Forest Home | 1 | Amador County | 95669 | |
| Forest Home | 1 | San Bernardino County | 92339 | |
| Forest Knolls | 1 | Marin County | 94933 | |
| Forest Lake | 1 | Lake County | | |
| Forest Meadows | 1 | Calaveras County | | |
| Forest Park | 1 | Santa Cruz County | 95006 | |
| Forest Ranch | 1 | Butte County | 95942 | |
| Forest Springs | 1 | Nevada County | 95945 | |
| Forest Springs | 1 | Santa Cruz County | 95006 | |
| Forestville | 1 | Sonoma County | 95436 | |
| Forks of Salmon | 1 | Siskiyou County | 96031 | |
| Fornis | 1 | El Dorado County | | |
| Forrest Park | 1 | Los Angeles County | 91350 | |
| Fort Baker | 1 | Marin County | 94965 | |
| Fort Barry | 1 | Marin County | 94965 | |
| Fort Bidwell | 1 | Modoc County | 96112 | |
| Fort Bidwell Indian Reservation | 1 | Modoc County | 95804 | |
| Fort Bragg | 1 | Mendocino County | 95437 | |
| Fort Cronkhite | 1 | Marin County | 94965 | |
| Fort Dick | 1 | Del Norte County | 95538 | |
| Fort Goff | 1 | Siskiyou County | | |
| Fort Hunter Liggett | 1 | Monterey County | 93928 | |
| Fort Independence Indian Reservation | 1 | Inyo County | 95825 | |
| Fort Irwin | 1 | San Bernardino County | 92310 | |
| Fort Jones | 1 | Siskiyou County | 96032 | |
| Fort MacArthur | 1 | Los Angeles County | 90731 | |
| Fort McDowell | 1 | San Francisco County | | |
| Fort Mason | 1 | San Francisco County | 94129 | |
| Fort Miley | 1 | San Francisco County | | |
| Fort Mojave Indian Reservation | 1 | San Bernardino County | 92363 | |
| Fort Ord | 1 | Monterey County | 93941 | |
| Fort Ord Village | 1 | Monterey County | 93941 | |
| Fort Piute | 1 | San Bernardino County | | |
| Fort Point National Historic Site | 1 | San Francisco County | 94129 | |
| Fort Romie | 1 | Monterey County | 93960 | |
| Fort Rosecrans | 1 | San Diego County | 92106 | |
| Fort Ross | 1 | Sonoma County | 95450 | |
| Fort Scott | 1 | San Francisco County | | |
| Fort Seward | 1 | Humboldt County | 95440 | |
| Fort Sutter | 1 | Sacramento County | 95816 | |
| Fortuna | 1 | Humboldt County | 95540 | |
| Fort Winfield Scott | 1 | San Francisco County | 94129 | |
| Fort Yuma | 1 | Imperial County | 92283 | |
| Fort Yuma Indian Reservation | 1 | Imperial County | 92283 | |
| Foster | 1 | San Diego County | | |
| Foster | 1 | Siskiyou County | | |
| Foster City | 1 | San Mateo County | 94404 | |
| Fountain Springs | 1 | Tulare County | | |
| Fountain Valley | 1 | Orange County | 92708 | |
| Four Corners | 1 | Contra Costa County | | |
| Four Corners | 1 | San Bernardino County | 92277 | |
| Four Corners | 1 | San Bernardino County | 93516 | |
| Four Corners | 1 | San Diego County | | |
| Four Corners | 1 | Sonoma County | | |
| Four Pines | 1 | Lake County | | |
| Four Points | 1 | Los Angeles County | | |
| Fouts Springs | 1 | Colusa County | 95979 | |
| Fowler | 1 | Fresno County | 93625 | |
| Foy | 1 | Los Angeles County | 90017 | |
| Frances | 1 | Orange County | | |
| Franciscan Park | 1 | San Mateo County | 94014 | |
| Franklin | 1 | Los Angeles County | | |
| Franklin | 1 | Napa County | 94559 | |
| Franklin | 1 | Sacramento County | 95624 | |
| Franklin | 1 | San Joaquin County | | |
| Frazier Park | 1 | Kern County | 93225 | |
| Freda | 1 | San Bernardino County | | |
| Fredericksburg | 1 | Alpine County | 96120 | |
| Freedom | 1 | Santa Cruz County | 95019 | |
| Freeman | 1 | Kern County | | |
| Freeport | 1 | Sacramento County | | |
| Freeport | 1 | Sacramento County | | |
| Freestone | 1 | Sonoma County | 95472 | |
| Freeway Park | 1 | Orange County | | |
| Fremont | 1 | Alameda County | 94536 | 55 |
| Fremont | 1 | San Bernardino County | | |
| Fremont | 1 | Yolo County | | |
| French Camp | 1 | San Joaquin County | 95231 | |
| French Corral | 1 | Nevada County | 95977 | |
| French Gulch | 1 | Shasta County | 96033 | |
| Frenchtown | 1 | El Dorado County | | |
| Frenchtown | 1 | Yuba County | | |
| Fresh Pond | 1 | El Dorado County | 95726 | |
| Freshwater | 1 | Humboldt County | 95501 | |
| Freshwater Corners | 1 | Humboldt County | | |
| Fresno | 1 | Fresno County | 93700 | 94 |
| Fresno Air National Guard Base | 1 | Fresno County | 93727 | |
| Fresno Air Terminal | 1 | Fresno County | 93727 | |
| Friant | 1 | Fresno County | 93626 | |
| Friendly Hills | 1 | Los Angeles County | | |
| Friendly Hills | 1 | San Bernardino County | 92252 | |
| Friendly Valley | 1 | Los Angeles County | 91321 | |
| Frink | 1 | Imperial County | | |
| Frontera | 1 | San Bernardino County | 91720 | |
| Frost | 1 | San Bernardino County | | |
| Fruitdale | 1 | Santa Clara County | | |
| Fruitland | 1 | Humboldt County | 95554 | |
| Fruitland | 1 | Los Angeles County | | |
| Fruitridge | 1 | Sacramento County | 95820 | |
| Fruitridge Manor | 1 | Sacramento County | | |
| Fruitvale | 1 | Alameda County | 94601 | |
| Fruitvale | 1 | Kern County | 93308 | |
| Fruto | 1 | Glenn County | 95988 | |
| Fuller | 1 | Imperial County | | |
| Fuller Acres | 1 | Kern County | | |
| Fuller Park | 1 | Orange County | | |
| Fullerton | 1 | Orange County | 92631 | 35 |
| Fulton | 1 | Sonoma County | 95439 | |
| Furnace Creek | 1 | Inyo County | | |
| Furnace Creek Ranch | 1 | Inyo County | | |