| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Onberg | city | Pennsylvania | United States | 40.66694 | -79.05528 | 1204 | 4156 |
| Oneida | city | Pennsylvania | United States | 40.92167 | -79.88 | 1072 | 10396 |
| Oneida | city | Pennsylvania | United States | 40.9075 | -76.12583 | 1696 | 3660 |
| Oniontown | city | Pennsylvania | United States | 41.34667 | -80.34056 | 1115 | 9969 |
| Onnalinda | city | Pennsylvania | United States | 40.30944 | -78.68028 | 2385 | 5854 |
| Ono | city | Pennsylvania | United States | 40.40278 | -76.535 | 429 | 9104 |
| Onspaugh Corners | city | Pennsylvania | United States | 41.64722 | -80.20889 | 1171 | 7183 |
| Ontario | city | Pennsylvania | United States | 40.10333 | -80.07472 | 1095 | 7048 |
| Ontelaunee | city | Pennsylvania | United States | 40.41694 | -75.94472 | 298 | 21765 |
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