| Cal to Oswego (Illinois) | 5,675.91 mi (9,134.49 km) |
| Cal to Oswego (New York) | 5,145.68 mi (8,281.17 km) |
| Cal to Otsego (Minnesota) | 5,677.15 mi (9,136.49 km) |
| Cal to Ottawa (Illinois) | 5,709.79 mi (9,189.02 km) |
| Cal to Ottawa (Kansas) | 6,080.00 mi (9,784.82 km) |
| Cal to Ottumwa (Iowa) | 5,854.76 mi (9,422.32 km) |
| Cal to Overland (Missouri) | 5,898.86 mi (9,493.30 km) |
| Cal to Overland Park (Kansas) | 6,044.71 mi (9,728.02 km) |
| Cal to Overlea (Maryland) | 5,322.72 mi (8,566.08 km) |
| Cal to Oviedo (Florida) | 6,008.67 mi (9,670.02 km) |
| Cal to Owasso (Oklahoma) | 6,222.11 mi (10,013.52 km) |
| Cal to Owatonna (Minnesota) | 5,724.87 mi (9,213.29 km) |
| Cal to Owensboro (Kentucky) | 5,822.41 mi (9,370.26 km) |
| Cal to Owings Mills (Maryland) | 5,332.00 mi (8,581.02 km) |
| Cal to Owosso (Michigan) | 5,460.11 mi (8,787.19 km) |
