| Risca to Orangevale (California) | 5,171.51 mi (8,322.75 km) |
| Risca to Orchards (Washington) | 4,812.95 mi (7,745.69 km) |
| Risca to Orcutt (California) | 5,364.04 mi (8,632.58 km) |
| Risca to Oregon (Ohio) | 3,677.04 mi (5,917.63 km) |
| Risca to Oregon (Wisconsin) | 3,850.30 mi (6,196.46 km) |
| Risca to Oregon City (Oregon) | 4,834.28 mi (7,780.02 km) |
| Risca to Orem (Utah) | 4,778.42 mi (7,690.12 km) |
| Risca to Orinda (California) | 5,246.87 mi (8,444.03 km) |
| Risca to Orland Park (Illinois) | 3,852.12 mi (6,199.39 km) |
| Risca to Orlando (Florida) | 4,214.20 mi (6,782.09 km) |
| Risca to Ormond Beach (Florida) | 4,163.59 mi (6,700.65 km) |
| Risca to Oro Valley (Arizona) | 5,180.41 mi (8,337.06 km) |
| Risca to Oroville (California) | 5,135.74 mi (8,265.17 km) |
| Risca to Oshkosh (Wisconsin) | 3,769.26 mi (6,066.04 km) |
| Risca to Oskaloosa (Iowa) | 4,049.44 mi (6,516.95 km) |
