| Siverek to Olympia Heights (Florida) | 6,562.15 mi (10,560.76 km) |
| Siverek to Omaha (Nebraska) | 6,294.45 mi (10,129.94 km) |
| Siverek to On Top of the World Designated Place (Florida) | 6,472.84 mi (10,417.03 km) |
| Siverek to Onalaska (Wisconsin) | 6,003.90 mi (9,662.35 km) |
| Siverek to Oneida (New York) | 5,525.08 mi (8,891.76 km) |
| Siverek to Oneonta (New York) | 5,532.43 mi (8,903.58 km) |
| Siverek to Ontario (California) | 7,259.98 mi (11,683.80 km) |
| Siverek to Ontario (Oregon) | 6,595.32 mi (10,614.14 km) |
| Siverek to Opa-locka (Florida) | 6,549.77 mi (10,540.83 km) |
| Siverek to Opelika (Alabama) | 6,410.44 mi (10,316.60 km) |
| Siverek to Opelousas (Louisiana) | 6,772.26 mi (10,898.90 km) |
| Siverek to Orange (California) | 7,279.34 mi (11,714.97 km) |
| Siverek to Orange (Texas) | 6,853.96 mi (11,030.39 km) |
| Siverek to Orange City (Florida) | 6,440.61 mi (10,365.15 km) |
| Siverek to Orangeburg (South Carolina) | 6,193.41 mi (9,967.33 km) |
