Pennsylvania Cities
- O'Donnell, PA
- O'Hara, PA
- Oak Forest, PA
- Oak Grove, PA
- Oak Hall, PA
- Oak Hill, PA
- Oak Hills, PA
- Oak Lane, PA
- Oak Park, PA
- Oak Ridge, PA
- Oak Shade, PA
- Oak Tree, PA
- Oakbourne, PA
- Oakdale, PA
- Oakford, PA
- Oakhurst, PA
- Oakland, PA
- Oakland, PA
- Oakland, PA
- Oakland Mills, PA
- Oakland Township, PA
- Oakland Township, PA
- Oakleigh, PA
- Oakley, PA
- Oaklyn, PA
- Oakmont, PA
- Oakryn, PA
- Oaks, PA
- Oaktree Hollow, PA
- Oakville, PA
- Oakwood, PA
- Obelisk, PA
- Oberlin, PA
- Ochre Mill, PA
- Odell, PA
- Odin, PA
- Ogden, PA
- Ogdensburg, PA
- Ogdonia, PA
- Ogle, PA
- Ogletown, PA
- Ohio, PA
- Ohiopyle, PA
- Ohioville, PA
- Ohl, PA
- Oil City, PA
- Oil Creek, PA
- Oklahoma, PA
- Okome, PA
- Olanta, PA
- Old Boston, PA
- Old Concord, PA
- Old Crabtree, PA
- Old Forge, PA
- Old Fort, PA
- Old Frame, PA
- Old Furnace, PA
- Old Lycoming, PA
- Old Mountain House, PA
- Old Orchard, PA
- Old Port, PA
- Old Shade Furnace, PA
- Old Side, PA
- Old Zionsville, PA
- Old Zollarsville, PA
- Oleona, PA
- Oleopolis, PA
- Oley, PA
- Oley Furnace, PA
- Oley Line, PA
- Oliphant Furnace, PA
- Oliveburg, PA
- Oliver, PA
- Oliver Manor, PA
- Oliver Mills, PA
- Oliver Township, PA
- Oliver Township, PA
- Oliver Township, PA
- Olivet, PA
- Olivia, PA
- Olmsted, PA
- Olmsville, PA
- Olyphant, PA
- Onberg, PA
- Oneida, PA
- Oniontown, PA
- Onnalinda, PA
- Ono, PA
- Ontario, PA
- Ontelaunee, PA
- Oppenheimer, PA
- Orange, PA
- Orangeville, PA
- Orbisonia, PA
- Orchard Beach, PA
- Orchard Crest, PA
- Orchard Hills, PA
- Ore Hill, PA
- Ore Valley, PA
- Orefield, PA
- Oregon, PA
- Oregon Hill, PA
- Oreland, PA
- Oreminea, PA
- Oreville, PA
- Orient, PA
- Oriental, PA
- Oriole, PA
- Ormrod, PA
- Ormsby, PA
- Orrstown, PA
- Orrtanna, PA
- Orson, PA
- Orvilla, PA
- Orville, PA
- Orviston, PA
- Orwell, PA
- Orwig, PA
- Orwigsburg, PA
- Orwin, PA
- Osborn, PA
- Osborne, PA
- Oscar, PA
- Osceola, PA
- Osceola Mills, PA
- Osgood, PA
- Oshanter, PA
- Ostend, PA
- Osterburg, PA
- Osterhout, PA
- Oswayo, PA
- Ott Town, PA
- Ottawa, PA
- Otter Creek, PA
- Otterbein, PA
- Otto, PA
- Ottsville, PA
- Outcrop, PA
- Outlet, PA
- Outwood, PA
- Oval, PA
- Overfield, PA
- Overlook, PA
- Overlook Heights, PA
- Overlook Springs, PA
- Overshot, PA
- Overton, PA
- Overview, PA
- Owassee, PA
- Owensdale, PA
- Owl Hollow, PA
- Owls Nest, PA
- Owltown, PA
- Oxford, PA
- Oxford Valley, PA
- Oyster Point, PA
