| Poplar Bluff to Orbetello | 5,075.38 mi (8,168.03 km) |
| Poplar Bluff to Oria | 5,421.34 mi (8,724.81 km) |
| Poplar Bluff to Oristano | 5,062.84 mi (8,147.86 km) |
| Poplar Bluff to Orta Nova | 5,307.04 mi (8,540.86 km) |
| Poplar Bluff to Orte | 5,123.33 mi (8,245.20 km) |
| Poplar Bluff to Ortona | 5,210.67 mi (8,385.76 km) |
| Poplar Bluff to Orvieto | 5,101.54 mi (8,210.14 km) |
| Poplar Bluff to Orzinuovi | 4,907.48 mi (7,897.83 km) |
| Poplar Bluff to Osimo | 5,126.83 mi (8,250.84 km) |
| Poplar Bluff to Ospitaletto | 4,907.20 mi (7,897.37 km) |
| Poplar Bluff to Ostuni | 5,409.17 mi (8,705.22 km) |
| Poplar Bluff to Ottaviano | 5,276.26 mi (8,491.33 km) |
| Poplar Bluff to Ovada | 4,883.80 mi (7,859.72 km) |
| Poplar Bluff to Ozieri | 5,054.33 mi (8,134.15 km) |
| Poplar Bluff to Paceco | 5,313.11 mi (8,550.62 km) |
