| Casamassima to Olympia Heights (Florida) | 5,427.20 mi (8,734.23 km) |
| Casamassima to Omaha (Nebraska) | 5,378.04 mi (8,655.12 km) |
| Casamassima to On Top of the World Designated Place (Florida) | 5,367.63 mi (8,638.36 km) |
| Casamassima to Onalaska (Wisconsin) | 5,074.16 mi (8,166.07 km) |
| Casamassima to Oneida (New York) | 4,490.26 mi (7,226.38 km) |
| Casamassima to Oneonta (New York) | 4,488.88 mi (7,224.16 km) |
| Casamassima to Ontario (California) | 6,503.63 mi (10,466.58 km) |
| Casamassima to Ontario (Oregon) | 5,905.41 mi (9,503.85 km) |
| Casamassima to Opa-locka (Florida) | 5,415.39 mi (8,715.23 km) |
| Casamassima to Opelika (Alabama) | 5,347.13 mi (8,605.38 km) |
| Casamassima to Opelousas (Louisiana) | 5,737.85 mi (9,234.17 km) |
| Casamassima to Orange (California) | 6,523.99 mi (10,499.35 km) |
| Casamassima to Orange (Texas) | 5,828.88 mi (9,380.67 km) |
| Casamassima to Orange City (Florida) | 5,329.09 mi (8,576.34 km) |
| Casamassima to Orangeburg (South Carolina) | 5,109.91 mi (8,223.61 km) |
