| Gary to Rockville (Maryland) | 563.62 mi (907.06 km) |
| Gary to Rockville Centre (New York) | 715.58 mi (1,151.62 km) |
| Gary to Rockwall (Texas) | 779.46 mi (1,254.42 km) |
| Gary to Rocky Mount (North Carolina) | 643.62 mi (1,035.81 km) |
| Gary to Rocky Point (New York) | 748.95 mi (1,205.31 km) |
| Gary to Rocky River (Ohio) | 284.28 mi (457.51 km) |
| Gary to Roessleville (New York) | 697.65 mi (1,122.76 km) |
| Gary to Rogers (Arkansas) | 515.89 mi (830.24 km) |
| Gary to Rogers (Minnesota) | 399.32 mi (642.64 km) |
| Gary to Rohnert Park (California) | 1,871.99 mi (3,012.68 km) |
| Gary to Rolla (Missouri) | 343.92 mi (553.48 km) |
| Gary to Rolling Meadows (Illinois) | 48.34 mi (77.80 km) |
| Gary to Roma (Texas) | 1,240.34 mi (1,996.14 km) |
| Gary to Rome (Georgia) | 519.53 mi (836.11 km) |
| Gary to Rome (New York) | 614.77 mi (989.38 km) |
