| Gaithersburg to Redondela | 3,499.59 mi (5,632.05 km) |
| Gaithersburg to Reinosa | 3,692.69 mi (5,942.81 km) |
| Gaithersburg to Requena | 3,936.45 mi (6,335.11 km) |
| Gaithersburg to Reus | 3,990.35 mi (6,421.85 km) |
| Gaithersburg to Rianxo | 3,481.08 mi (5,602.25 km) |
| Gaithersburg to Ribadeo | 3,543.41 mi (5,702.57 km) |
| Gaithersburg to Rincon de la Victoria | 3,866.07 mi (6,221.84 km) |
| Gaithersburg to Ripoll | 4,008.77 mi (6,451.50 km) |
| Gaithersburg to Ripollet | 4,028.72 mi (6,483.60 km) |
| Gaithersburg to Rojales | 3,997.85 mi (6,433.92 km) |
| Gaithersburg to Ronda | 3,821.70 mi (6,150.44 km) |
| Gaithersburg to Roquetas de Mar | 3,947.06 mi (6,352.18 km) |
| Gaithersburg to Rosas | 4,052.07 mi (6,521.18 km) |
| Gaithersburg to Rubi | 4,023.04 mi (6,474.45 km) |
| Gaithersburg to Rute | 3,843.57 mi (6,185.64 km) |
