| Nafplio to Olympia Heights (Florida) | 5,812.69 mi (9,354.62 km) |
| Nafplio to Omaha (Nebraska) | 5,763.84 mi (9,276.00 km) |
| Nafplio to On Top of the World Designated Place (Florida) | 5,756.92 mi (9,264.86 km) |
| Nafplio to Onalaska (Wisconsin) | 5,460.63 mi (8,788.03 km) |
| Nafplio to Oneida (New York) | 4,882.01 mi (7,856.84 km) |
| Nafplio to Oneonta (New York) | 4,880.75 mi (7,854.81 km) |
| Nafplio to Ontario (California) | 6,874.04 mi (11,062.70 km) |
| Nafplio to Ontario (Oregon) | 6,263.67 mi (10,080.41 km) |
| Nafplio to Opa-locka (Florida) | 5,800.99 mi (9,335.79 km) |
| Nafplio to Opelika (Alabama) | 5,738.77 mi (9,235.65 km) |
| Nafplio to Opelousas (Louisiana) | 6,129.75 mi (9,864.89 km) |
| Nafplio to Orange (California) | 6,894.34 mi (11,095.37 km) |
| Nafplio to Orange (Texas) | 6,220.74 mi (10,011.31 km) |
| Nafplio to Orange City (Florida) | 5,717.79 mi (9,201.90 km) |
| Nafplio to Orangeburg (South Carolina) | 5,500.89 mi (8,852.82 km) |
