| Potomac to Yuncos | 3,788.89 mi (6,097.63 km) |
| Potomac to Zafra | 3,712.36 mi (5,974.46 km) |
| Potomac to Zamora | 3,659.12 mi (5,888.78 km) |
| Potomac to Zaragoza | 3,885.62 mi (6,253.29 km) |
| Potomac to Zarautz | 3,780.03 mi (6,083.36 km) |
| Potomac to Zuera | 3,883.74 mi (6,250.28 km) |
| Potomac to Zumaia | 3,775.48 mi (6,076.04 km) |
| Potomac to Zumarraga | 3,778.52 mi (6,080.94 km) |
| Potomac to Longyearbyen | 3,629.11 mi (5,840.49 km) |
| Potomac to Ahus | 4,099.05 mi (6,596.78 km) |
| Potomac to Akersberga | 4,124.83 mi (6,638.28 km) |
| Potomac to Alingsas | 3,981.72 mi (6,407.96 km) |
| Potomac to Almhult | 4,075.20 mi (6,558.40 km) |
| Potomac to Alta | 4,128.32 mi (6,643.89 km) |
| Potomac to Amal | 3,957.28 mi (6,368.62 km) |
