| Peoria to Orbetello | 4,864.04 mi (7,827.92 km) |
| Peoria to Oria | 5,205.24 mi (8,377.02 km) |
| Peoria to Oristano | 4,862.59 mi (7,825.59 km) |
| Peoria to Orta Nova | 5,091.86 mi (8,194.55 km) |
| Peoria to Orte | 4,910.21 mi (7,902.23 km) |
| Peoria to Ortona | 4,994.89 mi (8,038.50 km) |
| Peoria to Orvieto | 4,888.15 mi (7,866.72 km) |
| Peoria to Orzinuovi | 4,689.98 mi (7,547.80 km) |
| Peoria to Osimo | 4,909.50 mi (7,901.07 km) |
| Peoria to Ospitaletto | 4,689.10 mi (7,546.38 km) |
| Peoria to Ostuni | 5,192.58 mi (8,356.66 km) |
| Peoria to Ottaviano | 5,064.18 mi (8,150.01 km) |
| Peoria to Ovada | 4,670.08 mi (7,515.76 km) |
| Peoria to Ozieri | 4,851.47 mi (7,807.69 km) |
| Peoria to Paceco | 5,111.75 mi (8,226.56 km) |
