| Name of place | Number of counties | Principal county | Lower zip code | Upper zip code | | Mabie | 1 | Plumas County | | |
| McArthur | 1 | Modoc County | 96053 | |
| McArthur | 1 | Shasta County | 96056 | |
| McAvoy | 1 | Contra Costa County | | |
| McCampbell | 1 | Los Angeles County | | |
| McCann | 1 | Humboldt County | 95569 | |
| McClellan Air Force Base | 1 | Sacramento County | 95652 | |
| McCloud | 1 | Siskiyou County | 96057 | |
| McColl | 1 | Shasta County | | |
| McConnel | 1 | Sacramento County | | |
| McCulloh | 1 | Placer County | | |
| Macdoel | 1 | Siskiyou County | 96058 | |
| McFarland | 1 | Kern County | 93250 | |
| McGill | 1 | Sonoma County | | |
| Machado | 1 | Los Angeles County | | |
| McHenry | 1 | Stanislaus County | | |
| McKay | 1 | Calaveras County | | |
| McKay | 1 | San Luis Obispo County | | |
| McKeon | 1 | Placer County | 95603 | |
| McKinleyville | 1 | Humboldt County | 95521 | |
| McKittrick | 1 | Kern County | 93251 | |
| McKnight Acres | 1 | Napa County | 94590 | |
| McLaren | 1 | San Francisco County | 94134 | |
| Maclay | 1 | Los Angeles County | 91340 | |
| McManus | 1 | El Dorado County | | |
| McMillan Manor | 1 | Ventura County | 93030 | |
| McNear | 1 | Sonoma County | | |
| McNears Beach | 1 | Marin County | | |
| Macomber Palms | 1 | Riverside County | | |
| McPherson | 1 | Orange County | | |
| Madeline | 1 | Lassen County | 96119 | |
| Madera | 1 | Madera County | 93637 | 39 |
| Madera | 1 | Madera County | | |
| Madera Acres | 1 | Madera County | 93637 | |
| Madison | 1 | Yolo County | 95653 | |
| Mad River | 1 | Trinity County | 95552 | |
| Madrone | 1 | Santa Clara County | 95037 | |
| Magalia | 1 | Butte County | 95954 | |
| Magnolia | 1 | Butte County | | |
| Magnolia | 1 | Imperial County | 92227 | |
| Magnolia | 1 | Santa Barbara County | 93111 | |
| Magnolia | 1 | Tulare County | | |
| Magnolia Avenue | 1 | Riverside County | | |
| Magnolia Center | 1 | Riverside County | 92506 | |
| Magnolia Park | 1 | Los Angeles County | 91505 | |
| Magra | 1 | Placer County | 95717 | |
| Magunden | 1 | Kern County | | |
| Mahou Riviera | 1 | Los Angeles County | | |
| Maine Prairie | 1 | Solano County | | |
| Majors | 1 | Santa Cruz County | | |
| Malaga | 1 | Fresno County | 93725 | |
| Malibu | 1 | Los Angeles County | 90265 | 65 |
| Malibu Beach | 1 | Los Angeles County | 90265 | |
| Malibu Bowl | 1 | Los Angeles County | | |
| Malibu Canyon Homes | 1 | Los Angeles County | 91364 | |
| Malibu Heights | 1 | Los Angeles County | 90265 | |
| Malibu Hills | 1 | Los Angeles County | | |
| Malibu Junction | 1 | Los Angeles County | | |
| Malibu Vista | 1 | Los Angeles County | | |
| Malott | 1 | Contra Costa County | 94530 | |
| Maltby | 1 | Contra Costa County | | |
| Maltha | 1 | Kern County | | |
| Mammoth | 1 | Modoc County | | |
| Mammoth Lakes | 1 | Mono County | 93546 | |
| Manchester | 1 | Mendocino County | 95459 | |
| Manchester-Point Arena Reservation | 1 | Mendocino County | | |
| Manchester Rancheria | 1 | Mendocino County | 95459 | |
| Manhattan Beach | 1 | Los Angeles County | 90266 | |
| Manila | 1 | Humboldt County | 95521 | |
| Manix | 1 | San Bernardino County | | |
| Mankas Corner | 1 | Solano County | 94585 | |
| Manlove | 1 | Sacramento County | | |
| Manly Fall | 1 | Inyo County | | |
| Manolith | 1 | Kern County | | |
| Manor | 1 | Marin County | 94930 | |
| Manteca | 1 | San Joaquin County | 95336 | |
| Manteca Junction | 1 | San Joaquin County | | |
| Manton | 1 | Tehama County | 96059 | |
| Manuel | 1 | Los Angeles County | | |
| Manuel Mill | 1 | Calaveras County | | |
| Manzana | 1 | Sonoma County | | |
| Manzanar | 1 | Inyo County | | |
| Manzanita | 1 | Butte County | 95948 | |
| Manzanita | 1 | Marin County | | |
| Manzanita | 1 | San Diego County | | |
| Manzanita Indian Reservation | 1 | San Diego County | 92263 | |
| Manzanita Lake | 1 | Shasta County | | |
| Maple Creek | 1 | Humboldt County | 95550 | |
| Maple Grove | 1 | Humboldt County | | |
| Maravilla Park | 1 | Los Angeles County | 90022 | |
| Marcel | 1 | Kern County | | |
| Marcelina | 1 | Los Angeles County | 90501 | |
| March | 1 | Riverside County | | |
| March Air Force Base | 1 | Riverside County | 92508 | |
| March Air Reserve Base | 1 | Riverside County | 92518 | |
| Marchant | 1 | Sutter County | | |
| March Field | 1 | Riverside County | 92518 | |
| Marconi | 1 | Marin County | | |
| Marcus Foster | 1 | Alameda County | 94624 | |
| Maredith Mill | 1 | Sierra County | | |
| Mare Island | 1 | Solano County | 94592 | |
| Mare Island Naval Shipyard | 1 | Solano County | 94592 | |
| Maricopa | 1 | Kern County | 93252 | |
| Marigold | 1 | San Bernardino County | 92373 | |
| Marilyn | 1 | Inyo County | | |
| Marina | 1 | Monterey County | 93933 | |
| Marina | 1 | San Francisco County | 94123 | |
| Marina del Rey | 1 | Los Angeles County | 90292 | |
| Marina District | 1 | San Francisco County | | |
| Marin City | 1 | Marin County | 94965 | |
| Marin Country Club Estates | 1 | Marin County | 94949 | |
| Marine Corps Air Station | 1 | Orange County | | |
| Marine Corps Base | 1 | San Bernardino County | 92278 | |
| Marine Corps Recruit Depot | 1 | San Diego County | 92140 | |
| Marine Corps Supply Center | 1 | San Bernardino County | | |
| Mariner | 1 | Orange County | 90740 | |
| Marinwood | 1 | Marin County | 94903 | |
| Mariposa | 1 | Mariposa County | 95338 | |
| Market | 1 | Los Angeles County | 90021 | |
| Marklee Village | 1 | Alpine County | 96120 | |
| Markleeville | 1 | Alpine County | 96120 | |
| Mark West | 1 | Sonoma County | 95404 | |
| Mark West Springs | 1 | Sonoma County | | |
| Marlboro | 1 | Orange County | | |
| Marloma | 1 | Los Angeles County | 90274 | |
| Marne | 1 | Los Angeles County | 91743 | |
| Marshall | 1 | Marin County | 94940 | |
| Marshall Junction | 1 | Fresno County | | |
| Marshall Station | 1 | Fresno County | 93612 | |
| Marsh Creek Springs | 1 | Contra Costa County | | |
| Marsh Manor | 1 | San Mateo County | | |
| Marsh Mill | 1 | Nevada County | | |
| Martell | 1 | Amador County | 95654 | |
| Martinez | 1 | Contra Costa County | 94553 | |
| Martinez | 1 | Riverside County | | |
| Martinez | 1 | Tuolumne County | | |
| Martins | 1 | Los Angeles County | | |
| Martins Beach | 1 | San Mateo County | 94019 | |
| Mar Vista | 1 | Los Angeles County | 90066 | |
| Marysville | 1 | Yuba County | 95901 | |
| Mason | 1 | Lassen County | | |
| Mason | 1 | San Francisco County | | |
| Massack | 1 | Plumas County | 95971 | |
| Matchin | 1 | Tulare County | | |
| Mather | 1 | Tuolumne County | | |
| Mather Air Force Base | 1 | Sacramento County | 95655 | |
| Mather Field | 1 | Sacramento County | 95655 | |
| Mather Heights | 1 | Sacramento County | 95655 | |
| Matheson | 1 | Shasta County | | |
| Mathews Mill | 1 | Fresno County | | |
| Matilija Springs | 1 | Ventura County | | |
| Mattei | 1 | Fresno County | | |
| Maxwell | 1 | Colusa County | 95955 | |
| May | 1 | Riverside County | | |
| Mayaro | 1 | Butte County | | |
| Maybury | 1 | Santa Clara County | | |
| Mayer Farms | 1 | Riverside County | | |
| Mayfair | 1 | Los Angeles County | | |
| Mayflower | 1 | Kern County | | |
| Mayflower Village | 1 | Los Angeles County | 91016 | |
| Mayhew | 1 | Sacramento County | | |
| Mayo | 1 | Los Angeles County | | |
| Mayten | 1 | Siskiyou County | | |
| Maywood | 1 | Los Angeles County | 90270 | |
| M C Log S B Pac | 1 | San Bernardino County | 92311 | |
| Mead | 1 | Shasta County | | |
| Meadowbrook | 1 | Riverside County | 92370 | |
| Meadowbrook Heights | 1 | Riverside County | | |
| Meadowbrook Woods | 1 | San Bernardino County | | |
| Meadow Lake Park | 1 | Nevada County | 95734 | |
| Meadow Lakes | 1 | Fresno County | 93602 | |
| Meadows | 1 | Sacramento County | | |
| Meadows Field Kern County Air Terminal | 1 | Kern County | 93306 | |
| Meadowsweet | 1 | Marin County | 94925 | |
| Meadow Valley | 1 | Plumas County | 95956 | |
| Meadow Vista | 1 | Placer County | 95722 | |
| Mead Valley | 1 | Riverside County | 92570 | |
| Meares | 1 | Modoc County | | |
| Mecca | 1 | Riverside County | 92254 | |
| Mechoopda | 1 | Amador County | | |
| Medicine Lake Lodge | 1 | Siskiyou County | 96134 | |
| Meeks Bay | 1 | El Dorado County | 96142 | |
| Meiners Oaks | 1 | Ventura County | 93023 | |
| Meiners Oaks-Mira Monte | 1 | Ventura County | | |
| Meinert | 1 | Contra Costa County | | |
| Meiss | 1 | El Dorado County | | |
| Melbourne | 1 | Mendocino County | | |
| Melita | 1 | Sonoma County | | |
| Mello | 1 | Yuba County | | |
| Melody Oaks Trailer Park | 1 | Amador County | 95642 | |
| Meloland | 1 | Imperial County | 92243 | |
| Melones | 1 | Calaveras County | 95222 | |
| Melrose | 1 | Alameda County | | |
| Melsons Corner | 1 | El Dorado County | 95684 | |
| Melvin | 1 | Fresno County | 93612 | |
| Mendocino | 1 | Mendocino County | 95460 | |
| Mendota | 1 | Fresno County | 93640 | |
| Menifee | 1 | Riverside County | 92584 | |
| Menifee Valley | 1 | Riverside County | | |
| Menlo Baths | 1 | Modoc County | | |
| Menlo Park | 1 | San Mateo County | 94025 | |
| Mentone | 1 | San Bernardino County | 92359 | |
| Merazo | 1 | Napa County | | |
| Merced | 1 | Merced County | 95340 | |
| Merced Falls | 1 | Merced County | 95369 | |
| Mercey Hot Springs | 1 | Fresno County | | |
| Mercuryville | 1 | Sonoma County | | |
| Meridian | 1 | Colusa County | | |
| Meridian | 1 | Kern County | | |
| Meridian | 1 | Santa Clara County | | |
| Meridian | 1 | Sutter County | 95957 | |
| Merlin | 1 | Plumas County | | |
| Merrill | 1 | San Bernardino County | 92335 | |
| Merrimac | 1 | Butte County | | |
| Merritt | 1 | Yolo County | | |
| Merritt-Peck Colonies | 1 | Fresno County | 93654 | |
| Merryman | 1 | Tulare County | | |
| Mesa | 1 | Inyo County | | |
| Mesa Camp | 1 | Mono County | | |
| Mesa Center | 1 | Orange County | 92627 | |
| Mesa Grande | 1 | San Diego County | 92070 | |
| Mesa Grande | 1 | Sonoma County | | |
| Mesa Grande Indian Reservation | 1 | San Diego County | 92059 | |
| Mesa Oaks | 1 | Santa Barbara County | | |
| Mesa Verde | 1 | Riverside County | 92225 | |
| Mesaville | 1 | Riverside County | | |
| Mesa Vista | 1 | Alpine County | | |
| Mesmer | 1 | Los Angeles County | | |
| Mesquite | 1 | Imperial County | | |
| Mesquite Oasis | 1 | San Diego County | | |
| Mesto | 1 | Orange County | | |
| Metro | 1 | Sacramento County | 95814 | |
| Metro Main | 1 | Sacramento County | 95801 | |
| Metropolitan | 1 | Humboldt County | 95540 | |
| Metropolitan | 1 | Los Angeles County | 90014 | |
| Metropolitan Oakland International Airport | 1 | Alameda County | 94621 | |
| Mettler | 1 | Kern County | 93301 | |
| Metz | 1 | Monterey County | 93960 | |
| Mexican Colony | 1 | Kern County | 93263 | |
| Meyers | 1 | El Dorado County | | |
| Meyers | 1 | San Joaquin County | | |
| Michigan Bluff | 1 | Placer County | 95631 | |
| Michillinda | 1 | Los Angeles County | 91107 | |
| Midas | 1 | Placer County | | |
| Mid City | 1 | San Joaquin County | 95202 | |
| Midco | 1 | Santa Barbara County | 93455 | |
| Middle Creek | 1 | Shasta County | | |
| Middlefield Road | 1 | San Mateo County | 94061 | |
| Middle River | 1 | San Joaquin County | 95234 | |
| Middleton | 1 | Napa County | | |
| Middletown | 1 | Lake County | 95461 | |
| Middletown Rancheria | 1 | Lake County | 95461 | |
| Midlake | 1 | Lake County | 95482 | |
| Midland | 1 | Riverside County | | |
| Midoil | 1 | Kern County | | |
| Midpines | 1 | Mariposa County | 95345 | |
| Midtown | 1 | Butte County | 95928 | |
| Midvalley | 1 | Tulare County | | |
| Midway | 1 | Alameda County | | |
| Midway | 1 | Colusa County | | |
| Midway | 1 | San Bernardino County | | |
| Midway | 1 | Shasta County | | |
| Midway City | 1 | Orange County | 92655 | |
| Midway Wells | 1 | Imperial County | 92248 | |
| Mikon | 1 | Yolo County | 95605 | |
| Mile High | 1 | Los Angeles County | | |
| Miles | 1 | San Luis Obispo County | | |
| Miley | 1 | Fresno County | | |
| Milford | 1 | Lassen County | 96121 | |
| Millbrae | 1 | San Mateo County | 94030 | |
| Millbrae Meadows | 1 | San Mateo County | 94030 | |
| Mill City | 1 | Mono County | 93533 | |
| Mill Creek | 1 | Tehama County | 96061 | |
| Mill Creek Park | 1 | San Bernardino County | 92359 | |
| Miller | 1 | Santa Clara County | | |
| Miller Farms | 1 | Riverside County | | |
| Millers Corners | 1 | Madera County | 93637 | |
| Millers Ranch | 1 | Monterey County | | |
| Millersville | 1 | Kern County | | |
| Millerton | 1 | Marin County | | |
| Milligan | 1 | San Bernardino County | | |
| Mills | 1 | Sacramento County | | |
| Mills | 1 | San Francisco County | 94104 | |
| Millsaps | 1 | Glenn County | | |
| Mills College | 1 | Alameda County | 94613 | |
| Millsdale | 1 | San Mateo County | 94010 | |
| Mills Orchard | 1 | Glenn County | 95951 | |
| Mills Orchards | 1 | Colusa County | | |
| Millspaugh | 1 | Inyo County | | |
| Millux | 1 | Kern County | | |
| Mill Valley | 1 | Marin County | 94941 | |
| Mill Valley Air Force Station | 1 | Marin County | 94941 | |
| Millville | 1 | Shasta County | 96062 | |
| Milo | 1 | Tulare County | 93265 | |
| Milpas | 1 | Santa Barbara County | 93108 | |
| Milpitas | 1 | Santa Clara County | 95035 | |
| Milton | 1 | Calaveras County | 95230 | |
| Mina | 1 | Mendocino County | | |
| Mineral | 1 | Tehama County | 96063 | |
| Mineral King | 1 | Tulare County | 93271 | |
| Mineral Slide | 1 | Butte County | | |
| Minkler | 1 | Fresno County | 93657 | |
| Minneola | 1 | San Bernardino County | | |
| Minnesota | 1 | Shasta County | | |
| Minnesota Flat | 1 | Sierra County | | |
| Mint Canyon | 1 | Los Angeles County | 91350 | |
| Minter Village | 1 | Kern County | | |
| Minturn | 1 | Madera County | | |
| Mirabel Heights | 1 | Sonoma County | 95436 | |
| Mirabel Park | 1 | Sonoma County | 95436 | |
| Miracle Hot Springs | 1 | Kern County | 93301 | |
| Miracle Manor | 1 | Kern County | 93501 | |
| Miracle Mile | 1 | Los Angeles County | 90036 | |
| Mirada | 1 | Los Angeles County | 90638 | |
| Mirada Hills | 1 | Los Angeles County | | |
| Mirador | 1 | Tulare County | | |
| Miraleste | 1 | Los Angeles County | 90274 | |
| Mira Loma | 1 | Riverside County | | |
| Mira Loma | 1 | Riverside County | 91752 | |
| Miramar | 1 | San Diego County | | |
| Miramar | 1 | San Mateo County | 94018 | |
| Miramar Naval Air Station | 1 | San Diego County | 92145 | |
| Mira Mesa | 1 | San Diego County | 92126 | |
| Miramonte | 1 | Fresno County | 93641 | |
| Miramonte | 1 | Los Angeles County | | |
| Mira Monte | 1 | Ventura County | 93023 | |
| Miranda | 1 | Humboldt County | 95553 | |
| Mira Vista | 1 | Contra Costa County | 94805 | |
| Missile View | 1 | Santa Barbara County | 93455 | |
| Mission | 1 | San Francisco County | | |
| Mission | 1 | San Luis Obispo County | 93401 | |
| Mission | 1 | Santa Clara County | 95051 | |
| Mission Annex | 1 | San Francisco County | 94103 | |
| Mission Beach | 1 | San Diego County | | |
| Mission Canyon | 1 | Santa Barbara County | | |
| Mission City Annex | 1 | Los Angeles County | 91345 | |
| Mission District | 1 | San Francisco County | | |
| Mission Highlands | 1 | Sonoma County | | |
| Mission Hills | 1 | Los Angeles County | 91345 | |
| Mission Hills | 1 | San Diego County | | |
| Mission Hills | 1 | Santa Barbara County | 93436 | |
| Mission Junction | 1 | Los Angeles County | | |
| Mission Rafael | 1 | Marin County | 94901 | |
| Mission San Jose | 1 | Alameda County | 94539 | |
| Mission San Jose District | 1 | Alameda County | | |
| Mission Soledad | 1 | Monterey County | | |
| Mission Springs | 1 | Santa Cruz County | 95062 | |
| Mission Viejo | 1 | Orange County | 92690 | |
| Missouri Triangle | 1 | Kern County | | |
| Mitchell Corner | 1 | Tulare County | 93291 | |
| Mitchell Mill | 1 | Calaveras County | 95257 | |
| Mitchells Corner | 1 | Kern County | | |
| Mi-Wuk Village | 1 | Tuolumne County | 95346 | |
| Moccasin | 1 | Plumas County | | |
| Moccasin | 1 | Tuolumne County | 95347 | |
| Mock | 1 | Inyo County | | |
| Mococo | 1 | Contra Costa County | 94553 | |
| Modesto | 1 | Stanislaus County | 95350 | 58 |
| Modesto Colony | 1 | Stanislaus County | | |
| Modesto-Empire Junction | 1 | Stanislaus County | | |
| Modesto Terminal | 1 | Stanislaus County | | |
| Modjeska | 1 | Orange County | 92667 | |
| Modjeska Canyon | 1 | Orange County | 92676 | |
| Moffett Field Naval Air Station | 1 | Santa Clara County | 94035 | |
| Mofuba | 1 | Sacramento County | | |
| Mohawk | 1 | Plumas County | | |
| Mohawk Vista | 1 | Plumas County | | |
| Mojave | 1 | Kern County | 93501 | |
| Mojave Heights | 1 | San Bernardino County | 92392 | |
| Mokelumne City | 1 | San Joaquin County | | |
| Mokelumne Hill | 1 | Calaveras County | 95245 | |
| Molena | 1 | Solano County | | |
| Molino | 1 | Sonoma County | | |
| Mollison Townhouses | 1 | San Diego County | | |
| Molus | 1 | Monterey County | | |
| Monaco | 1 | Los Angeles County | | |
| Monada | 1 | San Joaquin County | | |
| Monarch Bay | 1 | Orange County | 92629 | |
| Monarch Beach | 1 | Orange County | 92629 | |
| Mona Vista | 1 | Tuolumne County | 95370 | |
| Moneta | 1 | Los Angeles County | | |
| Monmouth | 1 | Fresno County | 93725 | |
| Mono Hot Springs | 1 | Fresno County | 93642 | |
| Monola | 1 | Inyo County | | |
| Monolith | 1 | Kern County | 93561 | |
| Mono Mills | 1 | Mono County | | |
| Mono Village | 1 | Mono County | | |
| Mono Vista | 1 | Tuolumne County | | |
| Monroe | 1 | Sonoma County | | |
| Monrovia | 1 | Los Angeles County | 91016 | |
| Mons | 1 | Riverside County | | |
| Monsanto | 1 | Contra Costa County | | |
| Monson | 1 | Tulare County | 93618 | |
| Montague | 1 | Siskiyou County | 96064 | |
| Montair | 1 | Contra Costa County | 94526 | |
| Montalvin Manor | 1 | Contra Costa County | 94806 | |
| Montalvo | 1 | Ventura County | 93005 | |
| Montana | 1 | Los Angeles County | 90402 | |
| Montara | 1 | San Mateo County | 94037 | |
| Monta Vista | 1 | Santa Clara County | 95014 | |
| Montclair | 1 | San Bernardino County | 91763 | |
| Montebello | 1 | Los Angeles County | 90640 | |
| Montebello Gardens | 1 | Los Angeles County | 90660 | |
| Montecito | 1 | Santa Barbara County | 93108 | |
| Monte Nido | 1 | Los Angeles County | 91302 | |
| Monterey | 1 | Monterey County | 93940 | |
| Monterey Acres | 1 | Los Angeles County | | |
| Monterey Bay Academy | 1 | Santa Cruz County | 95076 | |
| Monterey Park | 1 | Los Angeles County | 91754 | |
| Monterey Peninsula International Airport | 1 | Monterey County | 93940 | |
| Monte Rio | 1 | Sonoma County | 95462 | |
| Monte Rosa | 1 | Sonoma County | | |
| Montesano | 1 | Sonoma County | 95446 | |
| Monte Sereno | 1 | Santa Clara County | 95030 | |
| Monte Toyon | 1 | Santa Cruz County | 95003 | |
| Monte Vista | 1 | Placer County | | |
| Monte Vista | 1 | Santa Clara County | 95014 | |
| Montezuma | 1 | Solano County | | |
| Montgomery | 1 | Mendocino County | | |
| Montgomery City | 1 | Mono County | | |
| Montgomery Creek | 1 | Shasta County | 96065 | |
| Montgomery Creek Rancheria | 1 | Shasta County | 96065 | |
| Montgomery Village | 1 | Sonoma County | 95405 | |
| Montpelier | 1 | Stanislaus County | | |
| Montrose | 1 | Los Angeles County | 91020 | |
| Moody | 1 | Orange County | 90630 | |
| Mooney Flat | 1 | Nevada County | | |
| Moonridge | 1 | San Bernardino County | 92315 | |
| Moonstone | 1 | Humboldt County | 95570 | |
| Moore | 1 | San Bernardino County | | |
| Moore | 1 | Stanislaus County | | |
| Moores Flat | 1 | Nevada County | | |
| Moorpark | 1 | Ventura County | 93021 | |
| Moorpark Home Acres | 1 | Ventura County | 93021 | |
| Mopeco | 1 | Kern County | | |
| Morada | 1 | San Joaquin County | 95205 | |
| Moraga | 1 | Contra Costa County | 94556 | 75 |
| Moraga Town | 1 | Contra Costa County | 94556 | 75 |
| Moran | 1 | Lassen County | | |
| Mora Villa | 1 | Santa Barbara County | 93104 | |
| Moreland | 1 | Santa Clara County | | |
| Moreland Mill | 1 | Kern County | | |
| Morena | 1 | San Diego County | 92040 | |
| Morena Village | 1 | San Diego County | 92553 | |
| Moreno | 1 | Riverside County | 92360 | |
| Moreno | 1 | San Diego County | | |
| Moreno Valley | 1 | Riverside County | 92553 | |
| Morettis Junction | 1 | San Diego County | | |
| Morgan Hill | 1 | Santa Clara County | 95037 | |
| Morganhill | 1 | Santa Clara County | | |
| Morgan Springs | 1 | Tehama County | | |
| Mormon | 1 | San Joaquin County | | |
| Mormon Bar | 1 | Mariposa County | 95338 | |
| Morningside Park | 1 | Los Angeles County | 90305 | |
| Morongo Indian Reservation | 1 | Riverside County | 92263 | |
| Morongo Valley | 1 | San Bernardino County | 92256 | |
| Morrison | 1 | El Dorado County | | |
| Morristown | 1 | Sierra County | | |
| Morro Bay | 1 | San Luis Obispo County | 93442 | |
| Morro Bay | 1 | San Luis Obispo County | | |
| Morro Palisades | 1 | San Luis Obispo County | 93401 | |
| Morse | 1 | San Benito County | 95045 | |
| Mortero Palms | 1 | San Diego County | | |
| Mortmar | 1 | Riverside County | | |
| Moss | 1 | Imperial County | | |
| Moss Beach | 1 | San Mateo County | 94038 | |
| Mossdale | 1 | San Joaquin County | 95330 | |
| Moss Landing | 1 | Monterey County | | |
| Moss Landing | 1 | Monterey County | 95039 | |
| Motion | 1 | Shasta County | | |
| Motor City | 1 | El Dorado County | | |
| Motor Junction | 1 | San Bernardino County | | |
| Mott | 1 | Siskiyou County | | |
| Mounkes | 1 | Yuba County | | |
| Mountain Center | 1 | Riverside County | 92561 | |
| Mountain Gate | 1 | Shasta County | 96001 | |
| Mountain Home Village | 1 | San Bernardino County | 92359 | |
| Mountain House | 1 | San Joaquin County | | |
| Mountain Mesa | 1 | Kern County | 93240 | |
| Mountain Pass | 1 | San Bernardino County | 92366 | |
| Mountain Ranch | 1 | Calaveras County | 95246 | |
| Mountain Spring | 1 | San Diego County | 91934 | |
| Mountain View | 1 | Contra Costa County | | |
| Mountain View | 1 | Kern County | 93307 | |
| Mountain View | 1 | San Bernardino County | | |
| Mountain View | 1 | Santa Clara County | 94040 | 43 |
| Mountain View Acres | 1 | San Bernardino County | 92392 | |
| Mount Aukum | 1 | El Dorado County | 95656 | |
| Mount Baldy | 2 | Los Angeles County | 91759 | |
| Mount Baldy | 2 | San Bernardino County | 91759 | |
| Mount Bullion | 1 | Mariposa County | 95338 | |
| Mountclef Village | 1 | Ventura County | | |
| Mount Eden | 1 | Alameda County | 94557 | |
| Mount Eden Station | 1 | Alameda County | | |
| Mount Hamilton | 1 | Santa Clara County | 95140 | |
| Mount Hannah Lodge | 1 | Lake County | | |
| Mount Hebron | 1 | Siskiyou County | 96066 | |
| Mount Helix | 1 | San Diego County | 92041 | |
| Mount Hermon | 1 | Santa Cruz County | 95041 | |
| Mount Jackson | 1 | Sonoma County | | |
| Mount Laguna | 1 | San Diego County | 91948 | |
| Mount Laguna Air Force Station | 1 | San Diego County | 92048 | |
| Mount San Antonio | 1 | Los Angeles County | 91789 | |
| Mount Shasta | 1 | Siskiyou County | 96067 | |
| Mount Signal | 1 | Imperial County | 92231 | |
| Mount View | 1 | Contra Costa County | 94553 | |
| Mount Washington | 1 | Los Angeles County | | |
| Mount Wilson | 1 | Los Angeles County | 91023 | |
| Mugginsville | 1 | Siskiyou County | 96032 | |
| Muir | 1 | Contra Costa County | | |
| Muir | 1 | Mendocino County | 95490 | |
| Muir Beach | 1 | Marin County | 94965 | |
| Muir Woods National Monument | 1 | Marin County | 94941 | |
| Mulberry | 1 | Butte County | | |
| Mulford | 1 | Alameda County | | |
| Mulford Gardens | 1 | Alameda County | | |
| Mundo | 1 | Imperial County | | |
| Munyon | 1 | Imperial County | | |
| Murietta Farm | 1 | Fresno County | | |
| Muroc | 1 | Kern County | | |
| Murphys | 1 | Calaveras County | 95247 | |
| Murray | 1 | Kings County | | |
| Murray Park | 1 | Marin County | 94939 | |
| Murrieta | 1 | Riverside County | 92564 | |
| Murrieta Hot Springs | 1 | Riverside County | 92563 | |
| Muscat | 1 | San Bernardino County | | |
| Muscatel | 1 | Fresno County | | |
| Muscoy | 1 | San Bernardino County | 92405 | |
| Myers Flat | 1 | Humboldt County | 95554 | |
| Myoma | 1 | Riverside County | | |
| Myricks Corner | 1 | Kern County | | |
| Myrtletown | 1 | Humboldt County | 95501 | |
| Mystic | 1 | Nevada County | | |
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