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Index

The Communities of California (CA)

Select by first two letters of name

OA	OB	OC	OD	OG	OH
OI	OJ	OK	OL	OM	ON
OO	OP	OR	OS	OT	OU
OV	OW	OX	OZ

Notes about this Index:

#	Indicates a community that is historic and no longer exists. While a few buildings, houses or some ruins might still exists, most historic communities are gone with no trace.
?	Indicates what we call an Orphan. An Orphan is the situation where we have a name with very little information or we're uncertain whether the name is a community, a post office or might be railroad related such as a siding or station.
+	While a post office name generally indicates the community in which it is located, other PO names don't. In this case, we have a PO name but not the community in which its located.

O'Brien [Shasta Co]X

O'Byrnes Ferry [Calaveras Co]X

O'Neals [Fresno Co]Xo

O'Neals [Madera Co]X

O'Neil Place [Mendocino Co]X

O'rekw
See: Arekw

Oak
See: Happy Valley

Oak Bottom [Shasta Co]Xh

Oak Creek Hills [El Dorado Co]X

Oak Gardens Estates [Tuolumne Co]X

Oak Glen [Humboldt Co]X

Oak Glen [San Bernardino Co]X

Oak Grove [Butte Co]X

Oak Grove [Calaveras Co]X

Oak Grove [San Diego Co]X

Oak Grove [San Mateo Co]Xo

Oak Grove [Santa Clara Co]Xo

Oak Grove [Sonoma Co]Xo

Oak Grove [Tulare Co]X

Oak Grove [Yuba Co]Xh

Oak Haven Estates [Riverside Co]X

Oak Highlands [Shasta Co]
See: Happy Valley

Oak Hill [Los Angeles Co]X

Oak Hills [Monterey Co]X

Oak Hills [San Bernardino Co]X

Oak Knoll [Los Angeles Co]X

Oak Knoll [Napa Co]X

Oak Knoll Hills [Santa Clara Co]Xo

Oak Knolls [Santa Barbara Co]Xo

Oak Park [Sacramento Co]X

Oak Park [San Luis Obispo Co]X

Oak Park [Ventura Co]X

Oak Park Estates [Calaveras Co]X

Oak Ridge Village [El Dorado Co]X

Oak Run [Shasta Co]X

Oak Tree Village [El Dorado Co]X

Oak Valley [Ventura Co]Xo

Oak Valley [Yuba Co]X

Oak View [Ventura Co]X

Oak Village [Ventura Co]X

Oakbar [Siskiyou Co]X

Oakdale [Stanislaus Co]X

Oakhurst [Fresno Co]Xh

Oakhurst [Madera Co]X

Oakland [Alameda Co]X

Oakland [Yuba Co]Xh

Oakley [Contra Costa Co]X

Oakmont [Sonoma Co]X

Oakridge [San Joaquin Co]Xo

Oakridge Ranches [Riverside Co]X

Oaks [San Luis Obispo Co]X

Oakville [Napa Co]X

Oakwood [Los Angeles Co]Xo

Oasis [Mendocino Co]X

Oasis [Mono Co]Xo

Oasis [Riverside Co]X

Oat Hill [Napa Co]Xo

Oban [Los Angeles Co]X

Oberg [Los Angeles Co]Xh

Obie [Shasta Co]X

Obie Junction [Siskiyou Co]Xo

Obregon [Imperial Co]X

Occidental [Sonoma Co]X

Ocean Beach [San Diego Co]X

Ocean Hills [San Diego Co]X

Ocean Park [Los Angeles Co]X

Ocean Roar [Marin Co]X

Ocean View [Los Angeles Co]Xo

Ocean View [Orange Co]X

Ocean View [San Francisco Co]Xo

Ocean View [Sonoma Co]Xo

Ocean View Estates [Orange Co]X

Oceana [San Diego Co]X

Oceano [San Luis Obispo Co]X

Oceano Beach [San Luis Obispo Co]X

Oceanside [San Diego Co]X

Oceanview [San Francisco Co]X

Ochoyos [Santa Cruz Co]Xh

Ockenden [Fresno Co]X

Ocotillo [Imperial Co]X

Ocotillo Wells [San Diego Co]X

Octol [Tulare Co]X

Odd Fellows Park [Sonoma Co]X

Odessa [Kings Co]Xh

Ogilby [Imperial Co]Xh

Ogilby [San Diego Co]Xo

Ohio City
See: Buckeye

Ohm [Stanislaus Co]X

Ohmer [Contra Costa Co]Xh

Oil City [Kern Co]X

Oil Junction [Kern Co]X

Oildale [Kern Co]X

Ojai [Ventura Co]X
Other names:
Nordhoff

Ojala [Ventura Co]X

Ojo De Agua De La Coche [Santa Clara Co]X

Oketo [Humboldt Co]Xh

Okowvinjha [Los Angeles Co]Xh

Okpam [Sutter Co]Xh

Ola [Sutter Co]Xh

Olancha [Inyo Co]X

Olcott [Solano Co]X

Old Adobe [San Luis Obispo Co]X

Old Bailey Place [Mendocino Co]X

Old Bretz Mill [Fresno Co]X

Old Chinatown [Los Angeles Co]Xh

Old Corral [Madera Co]X

Old Creek [San Luis Obispo Co]Xo

Old Dale [San Bernardino Co]X

Old Dickenson Ferry [Merced Co]X

Old Dominion Mine [San Bernardino Co]Xh

Old Felton [Santa Cruz Co]Xo

Old Forbestown [Butte Co]X

Old Fort Jim [El Dorado Co]X

Old Fort Tejon [Kern Co]X

Old Garlock [Kern Co]X

Old Gilroy [Santa Clara Co]X

Old Hilltown [Monterey Co]X

Old Hopland [Mendocino Co]X

Old Hulbert Place [Modoc Co]X

Old Mammoth [Mono Co]X
Other names:
Mammoth City

Old Ornbaun Hot Springs [Mendocino Co]X

Old Pino [El Dorado Co]X

Old Point Comfort [Los Angeles Co]X

Old Red Rock Place [Mendocino Co]X

Old River [Kern Co]X

Old San Diego [San Diego Co]X

Old Station [Shasta Co]X

Old Town [Kern Co]X

Old Town [Marin Co]X

Old Town [Santa Barbara Co]X

Old Town [Ventura Co]X

Old Town San Diego [San Diego Co]X

Old Towne [Kern Co]Xo

Oleander [Fresno Co]X

Olema [Marin Co]X

Oleo [Orange Co]Xh

Oleta
See: Fiddletown

Oleum [Contra Costa Co]X

Olga [Los Angeles Co]X

Olig [Kern Co]Xh

Olinda [Orange Co]Xh

Olinda [Shasta Co]X

Olive [Orange Co]X

Olive Hill [Yuba Co]X

Olive Springs [Santa Cruz Co]Xh

Olive View [Los Angeles Co]X

Olivehain [San Diego Co]Xo

Olivehurst [Yuba Co]X

Olivenhain [San Diego Co]X

Oliver [Yuba Co]Xh

Oliveto [Sonoma Co]Xo

Olivewood [Los Angeles Co]Xo

Olney [Shasta Co]Xh

Ololopa [Butte Co]Xh

Olompali [Marin Co]X

Olposel [Lake Co]Xh

Olsen Crossing [Humboldt Co]X

Olulato [Solano Co]Xh

Olumpali [Marin Co]Xh

Olympia [Santa Cruz Co]X

Olympia Glade [Nevada Co]X

Olympic [Los Angeles Co]Xo

Olympic Heights [Nevada Co]X

Olympic Valley [Placer Co]Xo

Omaha Heights [Los Angeles Co]X

Omaxtux [Santa Barbara Co]Xh

Omega [Nevada Co]X

Omira [Lassen Co]X

Omo Ranch [El Dorado Co]X

Omochumnes [Sacramento Co]X

Omus [Sonoma Co]X

Onbi [Santa Cruz Co]Xh

Onchomo [El Dorado Co]Xh

One Hundred Palms [Riverside Co]X

One Mule Town
See: Muletown

One Wagon Town
See: Churntown

Oneida [Sierra Co]Xo

Oneonta [San Diego Co]Xo

Onisbo [Sacramento Co]Xo

Onkot [Ventura Co]Xh

Ono [San Bernardino Co]Xo

Ono [Shasta Co]X

Onomio [Santa Barbara Co]Xh

Ontario [San Bernardino Co]X

Onyx [Kern Co]X

Oo-moo-chah [Sacramento Co]Xh

Opal Cliffs [Santa Cruz Co]X

Opegoi [Humboldt Co]Xh

Opelto [Sacramento Co]Xh

Opera Plaza [San Francisco Co]X

Ophir [Placer Co]X

Ophir Hill Acres [Nevada Co]X

Ophirville [Placer Co]Xo

Opia [Santa Barbara Co]Xh

Opistopia [Santa Barbara Co]Xh

Opok [El Dorado Co]Xh

Optimo [Butte Co]Xo

Ora [Fresno Co]X

Orange [Orange Co]X

Orange Avenue Junction [Los Angeles Co]X

Orange Center [Riverside Co]Xo

Orange Cove [Fresno Co]X

Orange Glen [San Diego Co]Xo

Orange Heights [San Bernardino Co]Xo

Orange Park Acres [Orange Co]X

Orangehurst [Orange Co]Xo

Orangetree [Orange Co]X

Orangevale [Sacramento Co]X

Orangwood [Los Angeles Co]Xo

Orchams [Santa Barbara Co]X

Orchard [Sonoma Co]X

Orchard Camp [Los Angeles Co]Xh

Orcutt [San Diego Co]Xo

Orcutt [Santa Barbara Co]X

Ordbend [Glenn Co]X

Ordway [Riverside Co]X

Ore'q [Humboldt Co]Xh

Oregon Bar [Calaveras Co]Xh

Oregon City
See: Campo Seco

Oregon City [Butte Co]X
Other names:
Hengy
Bloomingdale

Oregon Gulch [Shasta Co]Xh

Oregon House [Yuba Co]X

Orella [Santa Barbara Co]Xh

Orestaco [San Benito Co]Xh

Orestimba [Stanislaus Co]X

Orford [San Joaquin Co]X

Orick [Humboldt Co]X

Oriental [Glenn Co]Xo

Orinda [Contra Costa Co]X

Orinda Park [Contra Costa Co]Xo

Orinda Village [Contra Costa Co]X

Orion [Kings Co]Xh

Orita [Imperial Co]X

Orland [Glenn Co]X

Orleans [Humboldt Co]X

Orleans Flat [Nevada Co]X

Orlem [Tulare Co]Xh

Ormand [Riverside Co]X

Oro Fino [Siskiyou Co]X

Oro Grande [San Bernardino Co]X
Other names:
Halleck

Oro Loma [Fresno Co]Xh

Oroleve [Butte Co]X

Orosi [Tulare Co]X

Oroville [Butte Co]X

Oroville East [Butte Co]Xo

Oroville Junction [Butte Co]X

Orr's [Mendocino Co]Xo

Orris [Tulare Co]X

Orrs Springs [Mendocino Co]X

Ortega [San Joaquin Co]Xh

Ortega [Santa Barbara Co]Xh

Ortonville [Ventura Co]X

Oruk
See: Arekw

Orwood [Contra Costa Co]X

Orwood Tract [Contra Costa Co]X

Osacalis [Santa Cruz Co]Xh

Osborne [Shasta Co]X

Osbourne [Los Angeles Co]Xo

Oso [Yuba Co]Xh

Ostrom [Yuba Co]Xh

Oswald [Sutter Co]X

Otai [San Diego Co]Xh

Otaki [Butte Co]Xh

Otay [San Diego Co]X

Otay Mesa [San Diego Co]X

Otenashmoo [Santa Barbara Co]Xh

Otey's Ranch [Siskiyou Co]Xo

Oteys Sierra Village [Inyo Co]Xh

Otterbein [Los Angeles Co]X

Outingdale [El Dorado Co]X

Outlet [Mendocino Co]Xo

Outpost Estates [Los Angeles Co]X

Oval [Tulare Co]Xo

Ovejo [Madera Co]Xh

Overlook [San Diego Co]X

Owensville [Inyo Co]Xh
Other names:
Glen Mary

Owenyo [Inyo Co]Xh
Other names:
New Owenyo

Owl [Riverside Co]X

Oxalis [Fresno Co]X

Oxford [Solano Co]X

Oxford Mill [Sierra Co]X

Oxnard [Ventura Co]X

Oxnard Beach [Ventura Co]X

Oxnard Shores [Ventura Co]X

Oxy [San Bernardino Co]Xo

Ozena [Ventura Co]Xo

Ozol [Contra Costa Co]X

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This page was last modified/updated: 17 Apr 2025