| Fairfield to Orangevale (California) | 53.05 mi (85.37 km) |
| Fairfield to Orchards (Washington) | 514.04 mi (827.27 km) |
| Fairfield to Orcutt (California) | 250.65 mi (403.38 km) |
| Fairfield to Oregon (Ohio) | 2,040.69 mi (3,284.18 km) |
| Fairfield to Oregon (Wisconsin) | 1,731.54 mi (2,786.64 km) |
| Fairfield to Oregon City (Oregon) | 490.26 mi (789.00 km) |
| Fairfield to Orem (Utah) | 570.02 mi (917.35 km) |
| Fairfield to Orinda (California) | 27.26 mi (43.87 km) |
| Fairfield to Orland Park (Illinois) | 1,813.18 mi (2,918.03 km) |
| Fairfield to Orlando (Florida) | 2,422.41 mi (3,898.49 km) |
| Fairfield to Ormond Beach (Florida) | 2,409.92 mi (3,878.39 km) |
| Fairfield to Oro Valley (Arizona) | 741.48 mi (1,193.29 km) |
| Fairfield to Oroville (California) | 89.43 mi (143.93 km) |
| Fairfield to Oshkosh (Wisconsin) | 1,773.62 mi (2,854.36 km) |
| Fairfield to Oskaloosa (Iowa) | 1,567.25 mi (2,522.25 km) |
