Pennsylvania cities which start with the letter O.
| Place | Place Type | 2010 Population |
|---|---|---|
| Oak Grove | ||
| Oak Lane | ||
| Oak Park | ||
| Oak Ridge | ||
| Oakdale | borough | 1459 |
| Oakford | ||
| Oakland | township | 1504 |
| Oakland Mills | ||
| Oaklyn | ||
| Oakmont | borough | 6303 |
| Oakryn | ||
| Oaks | ||
| Oakview | ||
| Oberlin | ||
| Observatory | ||
| Odin | ||
| Office Of Personnel Mgmt | ||
| Ogden | ||
| Ogdensburg | ||
| Ogontz Campus | ||
| Ohiopyle | borough | 59 |
| Oil City | city | 10557 |
| Oil Creek | township | 854 |
| Okome | ||
| Olanta | ||
| Old Forge | borough | 8313 |
| Old Line | ||
| Old Lycoming | township | 4938 |
| Old Port | ||
| Old Zionsville | ||
| Old Zionsvlle | ||
| Oley | township | 3620 |
| Oley Furnace | ||
| Oliphant Furnace | ||
| Oliveburg | ||
| Oliver | township | 1931 |
| Olyphant | borough | 5151 |
| Oneida | township | 1077 |
| Ono | ||
| Ontelaunee | township | 1646 |
| Opp | ||
| Orange | township | 1257 |
| Orangeville | borough | 508 |
| Orbisonia | borough | 428 |
| Ore Valley | ||
| Orefield | ||
| Oregon | township | 781 |
| Oregon Hill | ||
| Oreland | ||
| Oreville | ||
| Oriental | ||
| Oriole | ||
| Ormsby | ||
| Orrstown | borough | 262 |
| Orrtanna | ||
| Orson | ||
| Orviston | ||
| Orwigsburg | borough | 3099 |
| Orwin | ||
| Osceola | township | 659 |
| Osceola Mills | borough | 1141 |
| Osterburg | ||
| Oswayo | township | 278 |
| Ottawa | ||
| Ottsville | ||
| Outwood | ||
| Oval | ||
| Overbrook Hills | ||
| Overbrook Hls | ||
| Oxford | borough | 5077 |
| Oyster Point |
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