| Risca to Security-Widefield (Colorado) | 4,619.53 mi (7,434.41 km) |
| Risca to Sedalia (Missouri) | 4,196.13 mi (6,753.01 km) |
| Risca to Sedro-Woolley (Washington) | 4,646.26 mi (7,477.44 km) |
| Risca to Seguin (Texas) | 4,840.40 mi (7,789.86 km) |
| Risca to Selden (New York) | 3,291.33 mi (5,296.89 km) |
| Risca to Selma (Alabama) | 4,256.77 mi (6,850.62 km) |
| Risca to Selma (California) | 5,241.52 mi (8,435.41 km) |
| Risca to Selma (Texas) | 4,854.18 mi (7,812.05 km) |
| Risca to Seminole (Florida) | 4,306.83 mi (6,931.17 km) |
| Risca to Seven Hills (Ohio) | 3,619.39 mi (5,824.84 km) |
| Risca to Seven Oaks (South Carolina) | 3,934.97 mi (6,332.72 km) |
| Risca to Severn (Maryland) | 3,516.94 mi (5,659.97 km) |
| Risca to Severna Park (Maryland) | 3,513.86 mi (5,655.02 km) |
| Risca to Sevierville (Tennessee) | 3,947.51 mi (6,352.91 km) |
| Risca to Seymour (Indiana) | 3,897.65 mi (6,272.66 km) |
