| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oppelhausen | city | Oberosterreich | Austria | 48.05 | 13.03 | 1738 | 5522 |
| Oppenberg | city | Steiermark | Austria | 47.48 | 14.27 | 3349 | 2126 |
| Opping | city | Oberosterreich | Austria | 48.60 | 13.93 | 1906 | 6062 |
| Opponitz | city | Niederosterreich | Austria | 47.87 | 14.82 | 1801 | 2702 |