| South Houston to Rivalta di Torino | 5,362.04 mi (8,629.37 km) |
| South Houston to Rivarolo Canavese | 5,360.22 mi (8,626.43 km) |
| South Houston to Rivoli | 5,360.78 mi (8,627.34 km) |
| South Houston to Rocca di Papa | 5,702.55 mi (9,177.36 km) |
| South Houston to Rocca Priora | 5,704.06 mi (9,179.80 km) |
| South Houston to Roccapiemonte | 5,826.48 mi (9,376.81 km) |
| South Houston to Roccastrada | 5,589.52 mi (8,995.47 km) |
| South Houston to Romano di Lombardia | 5,438.65 mi (8,752.67 km) |
| South Houston to Rome | 5,687.69 mi (9,153.45 km) |
| South Houston to Roncade | 5,542.48 mi (8,919.76 km) |
| South Houston to Ronchi dei Legionari | 5,579.95 mi (8,980.06 km) |
| South Houston to Ronciglione | 5,661.18 mi (9,110.78 km) |
| South Houston to Rosa | 5,514.24 mi (8,874.32 km) |
| South Houston to Rosarno | 5,973.22 mi (9,612.97 km) |
| South Houston to Rosignano Marittimo | 5,545.26 mi (8,924.23 km) |
