| Roman to Orangevale (California) | 6,203.16 mi (9,983.02 km) |
| Roman to Orchards (Washington) | 5,774.61 mi (9,293.33 km) |
| Roman to Orcutt (California) | 6,432.75 mi (10,352.52 km) |
| Roman to Oregon (Ohio) | 4,979.08 mi (8,013.06 km) |
| Roman to Oregon (Wisconsin) | 5,112.18 mi (8,227.27 km) |
| Roman to Oregon City (Oregon) | 5,798.13 mi (9,331.20 km) |
| Roman to Orem (Utah) | 5,894.95 mi (9,487.00 km) |
| Roman to Orinda (California) | 6,273.76 mi (10,096.65 km) |
| Roman to Orland Park (Illinois) | 5,132.10 mi (8,259.31 km) |
| Roman to Orlando (Florida) | 5,581.58 mi (8,982.69 km) |
| Roman to Ormond Beach (Florida) | 5,529.49 mi (8,898.85 km) |
| Roman to Oro Valley (Arizona) | 6,361.35 mi (10,237.60 km) |
| Roman to Oroville (California) | 6,157.39 mi (9,909.35 km) |
| Roman to Oshkosh (Wisconsin) | 5,027.40 mi (8,090.82 km) |
| Roman to Oskaloosa (Iowa) | 5,304.29 mi (8,536.43 km) |
