The Communities of
Maryland (MD)

N O P Q R S T U V W x Y Z

Notes: - Some communities no longer exist and have been marked with '(H)' to indicate that they are historic.
- When two (or more) communities share the same name, we give some kind of identifying location to help you pick.

O'DonnellOakvilleOldfield Acres
O'Donnell Heights- Saint Mary's CountyOldtown
 - Somerset CountyOlive
Oak Acres- Anne Arundel CountyOliver Beach
Oak Court- Cecil CountyOlivet
Oak Crest- Charles CountyOlivet Hill
Oak Dale- Harford CountyOlney
Oak Estates Olney Acres
Oak ForestOakwood KnollsOlney Estates
Oak Forest ParkOakwood ManorOlney Mill
 Oakwood OverlookOlney Oaks
Oak GroveOakwood ParkOlney Square
- Anne Arundel CountyOakwood VillageOlney Town
- Cecil County  
- Prince George's CountyObligationOmar (H)
 Obretch EstatesOmar Acres
Oak HavenObservatory Heights 
Oak Hill One Spot
 OceanOnuatuc (H)
Oak Hill EstatesOcean Bay City 
- Charles CountyOcean CityOpament (H)
- Montgomery CountyOcean City HarborOpen Acres Manor
- Worcester CountyOcean PinesOpequon Farms
 Oceola Estates 
Oak HollowOctararo (H)Orange Grove
Oak KnollsOctararo Lakes- Baltimore County (H)
Oak LandingOctoraro 
Oak LeaOctoraro JunctionOrange Grove (H)
 Octoraro Park- Howard County (H)
Oak Orchard  
- Frederick CountyOddessyOrangeville
- Prince George's CountyOdentonOrangeville Station
- Baltimore CountyOdenton GardensOraville
- Frederick CountyOdenton HeightsOrchard Beach
- Garrett CountyOdenton ParkOrchard Estates
- Harford CountyOdonnell HeightsOrchard Gate At Piney Orchard
- Montgomery CountyOdysseyOrchard Hill
- Washington County  
 OellaOrchard Hills
Oak Ridge Manor - Baltimore County
Oak SpringsOffutt- Washington County
Oak SummitOffutt Ridge 
Oak Valley Orchard Lakes
Oak View VillageOgletown (H)Orchard Place
Oak West Orchard Point At Piney Orchard
OakbluffOil CityOrchard Pond
OakdaleOklahomaOrchard View
- Anne Arundel County - Cecil County
- Baltimore CountyOlacin- Prince George's County
- Montgomery CountyOld Annapolis Neck- Queen Anne's County
 Old Baltimore 
Oakdale AcresOld Bay TrailOrchards of Linthicum
Oakdale ManorOld BaysideOrchardview Estates
OakhillOld Cedar PointOrdnance
 Old ColonyOregon
OakhurstOld Colony CoveOriole
- Baltimore CountyOld County EstatesOrleans
- Montgomery CountyOld Dixie ManorOrme
  Orr Acres
OakingtonOld Farm 
Oakington Manor- Frederick CountyOsborn
 - Montgomery CountyOsborne
Oakland- Dorchester CountyOsborne Heights
- Anne Arundel County- Montgomery CountyOsborns Ruins
- Baltimore County  
- Caroline CountyOld Field PointOtter Point
- Carroll CountyOld FieldsOtterdale Mill
- Garrett CountyOld Ford HillsOttersdale
- Prince George's CountyOld Fort Acres 
- Caroline CountyOld Georgetown EstatesOverbrook
- Charles CountyOld Germantown- Frederick County
- Wicomico CountyOld Glory Beach 
 Old HickoryOverbrook
Oakland EstatesOld Home Estates- Prince George's County
Oakland HillOld House Cove Estates 
Oakland HillsOld Line Village of Fair HillOverbrook Manor
Oakland MillsOld MillOverlea
Oakland ParkOld Mill Bottom Estates 
Oakland TerraceOld Orchard EstatesOverlook
OaklandsOld Point Estates- Baltimore County
OaklawnOld Salem Village- Frederick County
Oaklee VillageOld Severna Park- Queen Anne's County
OakleighOld Sycamore Estates 
Oakleigh Forest Overton
Oakleigh ManorOld TownOverview Manor
Oakleigh Ridge- Baltimore City 
Oaklett Estates- Kent CountyOwen Brown
Oakley Owen Soper Woods
Oaklyn ManorOld Villa 
OakmontOld York Manor- Anne Arundel County
- Anne Arundel County- Baltimore County- Calvert County
- Harford County- Harford County 
- Montgomery County Owings
 Olde Colonial WoodsOwings Beach
Oakmont ManorOlde Fort VillageOwings Farm
 Olde MillOwings Hills
OakridgeOlde Mill EstatesOwings Mills
- Cecil CountyOlde Oak RunOwings Ridge
- Frederick CountyOlde Towne VillageOwings Station
 Olde Washington ValleyOwings Town Center
Oaks Owings Wood
Oaks of HarfordOldfieldOwl Hollow Acres
Oaks of Parsonage- Calvert County 
Oaks of Severna Park- Frederick County