| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Oak Forest | city | Pennsylvania | United States | 39.84194 | -80.23917 | 1371 | 4710 |
| Oak Grove | city | Pennsylvania | United States | 40.19333 | -80.27083 | 1095 | 36435 |
| Oak Grove | city | Pennsylvania | United States | 40.25944 | -79.20167 | 1299 | 4221 |
| Oak Grove | city | Pennsylvania | United States | 40.955 | -78.20889 | 1597 | 6573 |
| Oak Grove | city | Pennsylvania | United States | 39.73167 | -77.11389 | 600 | 9723 |
| Oak Grove | city | Pennsylvania | United States | 41.00778 | -76.71944 | 695 | 3676 |
| Oak Grove | city | Pennsylvania | United States | 41.04778 | -75.115 | 498 | 6865 |
| Oak Hall | city | Pennsylvania | United States | 40.79389 | -77.80278 | 1102 | 41970 |
| Oak Hill | city | Pennsylvania | United States | 41.41278 | -79.84 | 1335 | 11582 |
| Oak Hill | city | Pennsylvania | United States | 40.42583 | -79.81306 | 810 | 119052 |
| Oak Hill | city | Pennsylvania | United States | 41.15278 | -78.12222 | 1404 | 584 |
| Oak Hill | city | Pennsylvania | United States | 39.78194 | -76.09 | 403 | 5645 |
| Oak Hill | city | Pennsylvania | United States | 41.36583 | -75.71667 | 898 | 49964 |
| Oak Hills | city | Pennsylvania | United States | 40.82472 | -79.91333 | 1259 | 35163 |
| Oak Lane | city | Pennsylvania | United States | 39.90556 | -75.285 | 62 | 269219 |
| Oak Lane | city | Pennsylvania | United States | 40.05639 | -75.12167 | 200 | 417102 |
| Oak Lane Manor | city | Pennsylvania | United States | 40.05167 | -75.11167 | 98 | 417102 |
| Oak Manor | city | Pennsylvania | United States | 39.91722 | -76.67778 | 748 | 78641 |
| Oak Park | city | Pennsylvania | United States | 40.91389 | -76.76056 | 488 | 18391 |
| Oak Park | city | Pennsylvania | United States | 40.245 | -75.30333 | 321 | 68719 |
| Oak Ridge | city | Pennsylvania | United States | 41.0075 | -79.29611 | 1145 | 2286 |
| Oak Ridge | city | Pennsylvania | United States | 40.84944 | -78.49667 | 1755 | 1954 |
| Oak Shade | city | Pennsylvania | United States | 39.80444 | -76.11278 | 472 | 4963 |
| Oak Summit | city | Pennsylvania | United States | 40.095 | -75.16 | 298 | 249958 |
| Oak Tree | city | Pennsylvania | United States | 40.81056 | -79.05028 | 1322 | 2421 |
| Oakbourne | city | Pennsylvania | United States | 39.94028 | -75.57833 | 400 | 58191 |
| Oakdale | city | Pennsylvania | United States | 40.39806 | -80.18583 | 997 | 21906 |
| Oakdale | city | Pennsylvania | United States | 40.99194 | -75.92056 | 1522 | 30438 |
| Oakford | city | Pennsylvania | United States | 40.14833 | -74.96417 | 98 | 138778 |
| Oakgrove | city | Pennsylvania | United States | 40.3 | -77.27917 | 600 | 5026 |
| Oakhurst | city | Pennsylvania | United States | 40.35806 | -78.94472 | 1197 | 42402 |
| Oakland | city | Pennsylvania | United States | 40.98972 | -80.36972 | 1049 | 39880 |
| Oakland | city | Pennsylvania | United States | 41.23639 | -80.21889 | 1102 | 5062 |
| Oakland | city | Pennsylvania | United States | 40.44194 | -79.96278 | 984 | 274893 |
| Oakland | city | Pennsylvania | United States | 40.30639 | -78.88778 | 1630 | 53216 |
| Oakland | city | Pennsylvania | United States | 40.02028 | -75.64194 | 475 | 49036 |
| Oakland | city | Pennsylvania | United States | 41.95 | -75.60528 | 898 | 3121 |
| Oakland Mills | city | Pennsylvania | United States | 40.61444 | -77.31722 | 597 | 3718 |
| Oaklane | city | Pennsylvania | United States | 40.055 | -75.12333 | 200 | 417102 |
| Oakleigh | city | Pennsylvania | United States | 40.25806 | -76.82083 | 400 | 98705 |
| Oakley | city | Pennsylvania | United States | 41.73667 | -75.75472 | 977 | 2282 |
| Oaklyn | city | Pennsylvania | United States | 40.85833 | -76.75444 | 531 | 19158 |
| Oakmont | city | Pennsylvania | United States | 40.52167 | -79.8425 | 885 | 69236 |
| Oakmont | city | Pennsylvania | United States | 40.25167 | -76.69 | 669 | 27725 |
| Oakmont | city | Pennsylvania | United States | 39.98694 | -75.30833 | 275 | 234526 |
| Oakridge | city | Pennsylvania | United States | 39.93639 | -76.70917 | 547 | 85457 |
| Oakryn | city | Pennsylvania | United States | 39.77667 | -76.14167 | 393 | 4911 |
| Oaks | city | Pennsylvania | United States | 40.13167 | -75.46 | 101 | 46904 |
| Oaktree Hollow | city | Pennsylvania | United States | 40.14778 | -74.84083 | 49 | 141700 |
| Oakville | city | Pennsylvania | United States | 40.34361 | -79.70222 | 1010 | 40816 |
| Oakville | city | Pennsylvania | United States | 40.12611 | -77.45556 | 600 | 5950 |
| Oakwood | city | Pennsylvania | United States | 41.01056 | -80.37972 | 1030 | 27812 |
| Oakwood Park | city | Pennsylvania | United States | 40.24056 | -76.95917 | 396 | 58438 |
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