| Ramnicu Valcea to Olympia Heights (Florida) | 5,638.50 mi (9,074.30 km) |
| Ramnicu Valcea to Omaha (Nebraska) | 5,427.37 mi (8,734.51 km) |
| Ramnicu Valcea to On Top of the World Designated Place (Florida) | 5,551.12 mi (8,933.67 km) |
| Ramnicu Valcea to Onalaska (Wisconsin) | 5,130.16 mi (8,256.20 km) |
| Ramnicu Valcea to Oneida (New York) | 4,615.35 mi (7,427.69 km) |
| Ramnicu Valcea to Oneonta (New York) | 4,620.58 mi (7,436.11 km) |
| Ramnicu Valcea to Ontario (California) | 6,472.89 mi (10,417.10 km) |
| Ramnicu Valcea to Ontario (Oregon) | 5,837.88 mi (9,395.16 km) |
| Ramnicu Valcea to Opa-locka (Florida) | 5,626.13 mi (9,054.38 km) |
| Ramnicu Valcea to Opelika (Alabama) | 5,495.94 mi (8,844.87 km) |
| Ramnicu Valcea to Opelousas (Louisiana) | 5,865.88 mi (9,440.23 km) |
| Ramnicu Valcea to Orange (California) | 6,492.91 mi (10,449.33 km) |
| Ramnicu Valcea to Orange (Texas) | 5,950.51 mi (9,576.41 km) |
| Ramnicu Valcea to Orange City (Florida) | 5,518.18 mi (8,880.65 km) |
| Ramnicu Valcea to Orangeburg (South Carolina) | 5,274.56 mi (8,488.59 km) |
