| Santa Maria a Monte to Olympia Heights (Florida) | 5,060.86 mi (8,144.67 km) |
| Santa Maria a Monte to Omaha (Nebraska) | 5,015.72 mi (8,072.02 km) |
| Santa Maria a Monte to On Top of the World Designated Place (Florida) | 4,998.35 mi (8,044.07 km) |
| Santa Maria a Monte to Onalaska (Wisconsin) | 4,711.18 mi (7,581.91 km) |
| Santa Maria a Monte to Oneida (New York) | 4,120.33 mi (6,631.02 km) |
| Santa Maria a Monte to Oneonta (New York) | 4,118.64 mi (6,628.31 km) |
| Santa Maria a Monte to Ontario (California) | 6,156.99 mi (9,908.72 km) |
| Santa Maria a Monte to Ontario (Oregon) | 5,572.02 mi (8,967.30 km) |
| Santa Maria a Monte to Opa-locka (Florida) | 5,048.97 mi (8,125.54 km) |
| Santa Maria a Monte to Opelika (Alabama) | 4,976.49 mi (8,008.88 km) |
| Santa Maria a Monte to Opelousas (Louisiana) | 5,367.42 mi (8,638.02 km) |
| Santa Maria a Monte to Orange (California) | 6,177.40 mi (9,941.56 km) |
| Santa Maria a Monte to Orange (Texas) | 5,458.64 mi (8,784.84 km) |
| Santa Maria a Monte to Orange City (Florida) | 4,960.24 mi (7,982.74 km) |
| Santa Maria a Monte to Orangeburg (South Carolina) | 4,739.54 mi (7,627.55 km) |
