| Risca to Odessa (Texas) | 4,890.64 mi (7,870.72 km) |
| Risca to Ogden (Utah) | 4,737.42 mi (7,624.15 km) |
| Risca to Oildale (California) | 5,287.45 mi (8,509.32 km) |
| Risca to Ojus (Florida) | 4,290.38 mi (6,904.70 km) |
| Risca to Okemos (Michigan) | 3,668.76 mi (5,904.30 km) |
| Risca to Oklahoma City (Oklahoma) | 4,520.89 mi (7,275.66 km) |
| Risca to Okmulgee (Oklahoma) | 4,455.59 mi (7,170.58 km) |
| Risca to Olathe (Kansas) | 4,248.06 mi (6,836.59 km) |
| Risca to Old Jamestown (Missouri) | 4,075.65 mi (6,559.13 km) |
| Risca to Oldsmar (Florida) | 4,291.66 mi (6,906.77 km) |
| Risca to Olean (New York) | 3,459.11 mi (5,566.90 km) |
| Risca to Olive Branch (Mississippi) | 4,245.79 mi (6,832.95 km) |
| Risca to Olivehurst (California) | 5,159.47 mi (8,303.36 km) |
| Risca to Olney (Maryland) | 3,531.91 mi (5,684.06 km) |
| Risca to Olympia (Washington) | 4,746.71 mi (7,639.10 km) |
