| Callaway to Olympia Heights (Florida) | 440.72 mi (709.28 km) |
| Callaway to Omaha (Nebraska) | 966.89 mi (1,556.06 km) |
| Callaway to On Top of the World Designated Place (Florida) | 208.88 mi (336.17 km) |
| Callaway to Onalaska (Wisconsin) | 999.45 mi (1,608.47 km) |
| Callaway to Oneida (New York) | 1,047.43 mi (1,685.68 km) |
| Callaway to Oneonta (New York) | 1,030.58 mi (1,658.55 km) |
| Callaway to Ontario (California) | 1,887.67 mi (3,037.91 km) |
| Callaway to Ontario (Oregon) | 1,962.85 mi (3,158.90 km) |
| Callaway to Opa-locka (Florida) | 436.00 mi (701.68 km) |
| Callaway to Opelika (Alabama) | 174.87 mi (281.43 km) |
| Callaway to Opelousas (Louisiana) | 389.99 mi (627.64 km) |
| Callaway to Orange (California) | 1,900.30 mi (3,058.23 km) |
| Callaway to Orange (Texas) | 490.15 mi (788.82 km) |
| Callaway to Orange City (Florida) | 269.65 mi (433.97 km) |
| Callaway to Orangeburg (South Carolina) | 359.98 mi (579.33 km) |
