This list of cities, towns, unincorporated communities, counties, and other recognized places in the U.S. state of Pennsylvania also includes information on the number and names of counties in which the place lies, and its lower and upper zip code bounds, if applicable.
Name of placeNumber of countiesPrincipal countyLower zip codeUpper zip codeOak Forest1Greene County15370 Oak Grove1Adams County Oak Grove1Clearfield County16858 Oak Grove1Monroe County Oak Grove1Montour County Oak Grove1Schuylkill County17963 Oak Grove1Washington County Oak Grove1Westmoreland County15658 Oak Hall1Centre County16827 Oak Hill1Allegheny County1513715145Oak Hill1Clearfield County16845 Oak Hill1Lackawanna County18507 Oak Hill1Lancaster County Oak Hill1Venango County Oak Hills1Butler County Oak Lane1Montgomery County19012 Oak Lane1Philadelphia County19126 Oak Park1Montgomery County19446 Oak Park1Northumberland County17857 Oak Ridge2Armstrong County16245 Oak Ridge1Clearfield County Oak Shade1Lancaster County17566 Oak Tree1Indiana County Oakbottom1Lancaster County17566 Oakbourne1Chester County Oakbrook1Berks County Oakdale1Allegheny County15071 Oakdale1Luzerne County18224 Oakford1Bucks County19053 Oakhurst1Cambria County Oakland1Allegheny County15213 Oakland1Armstrong County Oakland1Cambria County Oakland1Lawrence County16101 Oakland1Mercer County Oakland1Susquehanna County18847 Oakland Beach1Crawford County16316 Oakland Mills1Juniata County17076 Oakland Township1Butler County Oakland Township1Susquehanna County Oakland Township1Venango County Oaklane Manor1Montgomery County19012 Oakleigh1Dauphin County17111 Oakley1Susquehanna County Oaklyn1Northumberland County17801 Oakmont1Allegheny County15139 Oakmont1Cambria County15904 Oakmont1Delaware County15139 Oakryn1Lancaster County17563 Oaks1Montgomery County19456 Oaktree Hollow1Bucks County Oakvale Boulevard1Butler County16002 Oakville1Cumberland County17257 Oakville1Westmoreland County15650 Oakwood1Lawrence County Obelisk1Montgomery County19492 Oberlin1Dauphin County17113 Oberlin Gardens1Dauphin County17113 Obold1Berks County Ochre Mill1Luzerne County Odell1Washington County Odenthal1Cambria County15946 Odenwelder1Northampton County18042 Odin1Potter County16915 O'Donnell1Jefferson County Ogden1Delaware County19061 Ogden Park1Delaware County19062 Ogdensburg1Tioga County17765 Ogdonia1Sullivan County Ogle1Butler County16046 Ogle Township1Somerset County Ogletown1Somerset County15963 Ogontz1Montgomery County19117 O'Hara Township1Allegheny County Ohio Township1Allegheny County Ohio Township1Beaver County Ohiopyle1Fayette County15470 Ohioview1Beaver County15052 Ohioville1Beaver County15059 Ohl1Jefferson County15864 Oil City1Cambria County15925 Oil City1Venango County16301 Oil Creek1Venango County16301 Oil Creek Township1Crawford County Oilcreek Township1Venango County Oklahoma1Clearfield County15801 Oklahoma1Westmoreland County15613 Okome1Lycoming County17739 Olanta1Clearfield County16863 Old Boston1Luzerne County18641 Old Clarendon1Warren County16313 Old Concord1Washington County15329 Old Crabtree1Westmoreland County15650 Old Cranberry1Luzerne County Old Enon1Lawrence County16120 Old Forge1Delaware County19060 Old Forge1Franklin County Old Forge1Lackawanna County18518 Old Fort1Centre County Old Frame1Fayette County15478 Old Furnace1Beaver County Old Junction1Somerset County15501 Old Line1Lancaster County17545 Old Lycoming Township1Lycoming County Old Meadow1Westmoreland County15683 Old Mountain House1Fulton County Old Orchard1Northampton County18042 Old Port1Juniata County17082 Old Shade Furnace1Somerset County Old Side1Centre County Old Stanton1Westmoreland County15672 Old Zionsville1Lehigh County18068 Old Zollarsville1Washington County Oleona1Potter County Oleopolis1Venango County16301 Oley1Berks County19547 Oley Furnace1Berks County1952219547Oley Line1Berks County19547 Oley Township1Berks County Oliphant Furnace1Fayette County15401 Oliveburg1Jefferson County15764 Oliver1Fayette County15472 Oliver Mills1Luzerne County Oliver Township1Jefferson County Oliver Township1Mifflin County Oliver Township1Perry County Olivers Mills1Luzerne County18702 Olivet1Armstrong County15618 Olmsted1Potter County Olmsville1Tioga County Olney1Philadelphia County19120 Olyphant1Lackawanna County18447 Onberg1Indiana County15701 Oneida1Butler County16001 Oneida1Schuylkill County18242 Oneida Junction1Luzerne County18201 Oneida Township1Huntingdon County Oniontown1Mercer County Onnalinda1Cambria County15921 Ono1Lebanon County17077 Onspaugh Corners1Crawford County Ontario1Washington County15324 Ontelaunee1Berks County19605 Ontelaunee Township1Berks County Opp1Lycoming County17756 Oppenheimer1Bedford County Oppermans Corner1Chester County19425 Option1Allegheny County15236 Orange1Luzerne County18612 Orange Township1Columbia County Orangeville1Columbia County17859 Orbisonia1Huntingdon County17243 Orchard Beach1Erie County16428 Orchard Crest1Cumberland County Orchard Crossing1Blair County16686 Orchard Hill1Westmoreland County15666 Orchard Hills1Armstrong County15613 Orchard Hills1Delaware County19063 Orchard Park1Lancaster County17601 Ore Hill1Blair County16673 Ore Valley1York County17403 Orefield1Lehigh County18069 Oregon1Lancaster County17540 Oregon Hill1Lycoming County16938 Oregon Township1Wayne County Oreland1Montgomery County19075 Oreminea1Blair County16693 Oreville1Berks County19539 Orient1Fayette County15420 Oriental1Juniata County17045 Oriole1Lycoming County17740 Ormrod1Lehigh County18037 Ormsby1McKean County16726 Orners Corner1Blair County16601 Orrstown1Franklin County17244 Orrtanna1Adams County17353 Orrton1Berks County Orrville1Allegheny County15144 Orson1Wayne County18449 Orvilla1Montgomery County19440 Orville1Allegheny County15144 Orviston1Centre County16864 Orwell1Bradford County18837 Orwell Township1Bradford County Orwig1York County Orwigsburg1Schuylkill County17961 Orwin1Schuylkill County17980 Osborn1Mercer County Osborne1Allegheny County15143 Oscar1Armstrong County Osceola1Clearfield County Osceola1Tioga County16942 Osceola Mills1Clearfield County16666 Osceola Township1Tioga County Osgood1Mercer County16125 Oshanter1Clearfield County16830 Ostend1Clearfield County15757 Osterburg1Bedford County16667 Osterhout1Wyoming County18657 Oswayo1Potter County16915 Oswayo Township1Potter County Ott Town1Bedford County15537 Ottawa1Montour County17821 Otter Creek Township1Mercer County Otterbein1Franklin County Otto1Northumberland County Otto Township1McKean County Ottown1Bedford County15537 Ottsville1Bucks County18942 Outcrop1Fayette County15478 Outlet1Luzerne County18612 Outwood1Schuylkill County17963 Oval1Lycoming County17759 Overbrook1Allegheny County Overbrook1Philadelphia County19151 Overbrook Hills1Montgomery County19151 Overfield Township1Wyoming County Overholt Acres1Westmoreland County15642 Overleigh1Montgomery County19004 Overlook1Lancaster County17601 Overlook1Northumberland County Overlook Heights1Centre County Overlook Springs1Lehigh County Overshot1Bradford County Overton1Bradford County18833 Overton Township1Bradford County Overview1Cumberland County17053 Owassee1Tioga County Owens Corners1Erie County Owensdale1Fayette County15425 Owl Hollow1Bradford County Owls Nest1Elk County Owltown1Venango County Oxford1Chester County19363 Oxford Township1Adams County Oxford Valley1Bucks County Oyster Point1Lancaster County17601