| Risca to Somersworth (New Hampshire) | 3,104.13 mi (4,995.61 km) |
| Risca to Somerton (Arizona) | 5,301.22 mi (8,531.50 km) |
| Risca to Somerville (Massachusetts) | 3,147.91 mi (5,066.08 km) |
| Risca to Somerville (New Jersey) | 3,368.57 mi (5,421.19 km) |
| Risca to Sonoma (California) | 5,231.95 mi (8,420.02 km) |
| Risca to Soquel (California) | 5,290.37 mi (8,514.02 km) |
| Risca to South Bend (Indiana) | 3,787.19 mi (6,094.89 km) |
| Risca to South Bradenton (Florida) | 4,317.46 mi (6,948.27 km) |
| Risca to South Burlington (Vermont) | 3,150.74 mi (5,070.62 km) |
| Risca to South Charleston (West Virginia) | 3,757.81 mi (6,047.61 km) |
| Risca to South Daytona (Florida) | 4,166.11 mi (6,704.70 km) |
| Risca to South El Monte (California) | 5,333.28 mi (8,583.09 km) |
| Risca to South Elgin (Illinois) | 3,851.98 mi (6,199.16 km) |
| Risca to South Euclid (Ohio) | 3,607.10 mi (5,805.07 km) |
| Risca to South Farmingdale (New York) | 3,314.40 mi (5,334.01 km) |
