| Spalding to Olympia Heights (Florida) | 4,421.27 mi (7,115.35 km) |
| Spalding to Omaha (Nebraska) | 4,243.24 mi (6,828.83 km) |
| Spalding to On Top of the World Designated Place (Florida) | 4,327.47 mi (6,964.39 km) |
| Spalding to Onalaska (Wisconsin) | 3,940.99 mi (6,342.42 km) |
| Spalding to Oneida (New York) | 3,394.00 mi (5,462.11 km) |
| Spalding to Oneonta (New York) | 3,397.90 mi (5,468.39 km) |
| Spalding to Ontario (California) | 5,361.66 mi (8,628.76 km) |
| Spalding to Ontario (Oregon) | 4,772.20 mi (7,680.12 km) |
| Spalding to Opa-locka (Florida) | 4,408.73 mi (7,095.17 km) |
| Spalding to Opelika (Alabama) | 4,271.65 mi (6,874.56 km) |
| Spalding to Opelousas (Louisiana) | 4,645.45 mi (7,476.13 km) |
| Spalding to Orange (California) | 5,382.04 mi (8,661.56 km) |
| Spalding to Orange (Texas) | 4,731.85 mi (7,615.17 km) |
| Spalding to Orange City (Florida) | 4,295.45 mi (6,912.87 km) |
| Spalding to Orangeburg (South Carolina) | 4,049.59 mi (6,517.19 km) |
