| Risca to Oakley (California) | 5,225.67 mi (8,409.90 km) |
| Risca to Oakton (Virginia) | 3,552.82 mi (5,717.72 km) |
| Risca to Oakville (Missouri) | 4,095.72 mi (6,591.43 km) |
| Risca to Oatfield (Oregon) | 4,830.33 mi (7,773.67 km) |
| Risca to Ocala (Florida) | 4,213.75 mi (6,781.38 km) |
| Risca to Ocean Acres (New Jersey) | 3,390.70 mi (5,456.81 km) |
| Risca to Ocean City (New Jersey) | 3,424.70 mi (5,511.53 km) |
| Risca to Ocean Pines (Maryland) | 3,486.29 mi (5,610.64 km) |
| Risca to Ocean Pointe (Hawaii) | 7,174.57 mi (11,546.36 km) |
| Risca to Ocean Springs (Mississippi) | 4,428.36 mi (7,126.75 km) |
| Risca to Oceanside (California) | 5,355.11 mi (8,618.21 km) |
| Risca to Oceanside (New York) | 3,325.81 mi (5,352.37 km) |
| Risca to Ocoee (Florida) | 4,217.40 mi (6,787.24 km) |
| Risca to Oconomowoc (Wisconsin) | 3,808.37 mi (6,128.99 km) |
| Risca to Odenton (Maryland) | 3,519.94 mi (5,664.80 km) |
