| Piqua to Nasaud | 4,979.27 mi (8,013.36 km) |
| Piqua to Navodari | 5,266.71 mi (8,475.95 km) |
| Piqua to Negresti-Oas | 4,918.16 mi (7,915.01 km) |
| Piqua to Nehoiu | 5,135.27 mi (8,264.42 km) |
| Piqua to Ocna Mures | 4,999.57 mi (8,046.03 km) |
| Piqua to Odobesti | 5,143.40 mi (8,277.51 km) |
| Piqua to Odorheiu Secuiesc | 5,055.08 mi (8,135.37 km) |
| Piqua to Oltenita | 5,206.11 mi (8,378.43 km) |
| Piqua to Onesti | 5,110.00 mi (8,223.75 km) |
| Piqua to Oradea | 4,898.81 mi (7,883.87 km) |
| Piqua to Orastie | 4,999.51 mi (8,045.94 km) |
| Piqua to Oravita | 4,978.82 mi (8,012.64 km) |
| Piqua to Orsova | 5,019.50 mi (8,078.11 km) |
| Piqua to Otelu Rosu | 4,982.81 mi (8,019.05 km) |
| Piqua to Otopeni | 5,163.86 mi (8,310.42 km) |
