| Cal to Orangevale (California) | 6,813.70 mi (10,965.60 km) |
| Cal to Orchards (Washington) | 6,391.83 mi (10,286.66 km) |
| Cal to Orcutt (California) | 7,038.29 mi (11,327.03 km) |
| Cal to Oregon (Ohio) | 5,494.92 mi (8,843.22 km) |
| Cal to Oregon (Wisconsin) | 5,652.27 mi (9,096.46 km) |
| Cal to Oregon City (Oregon) | 6,415.22 mi (10,324.31 km) |
| Cal to Orem (Utah) | 6,488.81 mi (10,442.73 km) |
| Cal to Orinda (California) | 6,885.20 mi (11,080.65 km) |
| Cal to Orland Park (Illinois) | 5,662.33 mi (9,112.63 km) |
| Cal to Orlando (Florida) | 6,023.80 mi (9,694.37 km) |
| Cal to Ormond Beach (Florida) | 5,974.99 mi (9,615.82 km) |
| Cal to Oro Valley (Arizona) | 6,939.21 mi (11,167.58 km) |
| Cal to Oroville (California) | 6,769.14 mi (10,893.88 km) |
| Cal to Oshkosh (Wisconsin) | 5,569.12 mi (8,962.63 km) |
| Cal to Oskaloosa (Iowa) | 5,848.53 mi (9,412.29 km) |
