| Potomac to Madison (Mississippi) | 853.35 mi (1,373.34 km) |
| Potomac to Madison (New Jersey) | 190.27 mi (306.21 km) |
| Potomac to Madison (Wisconsin) | 694.14 mi (1,117.11 km) |
| Potomac to Madison Heights (Michigan) | 392.12 mi (631.05 km) |
| Potomac to Madison Heights (Virginia) | 149.86 mi (241.18 km) |
| Potomac to Madisonville (Kentucky) | 571.40 mi (919.58 km) |
| Potomac to Magalia (California) | 2,346.51 mi (3,776.35 km) |
| Potomac to Magna (Utah) | 1,845.36 mi (2,969.82 km) |
| Potomac to Magnolia (Arkansas) | 976.54 mi (1,571.59 km) |
| Potomac to Maili (Hawaii) | 4,831.18 mi (7,775.03 km) |
| Potomac to Maitland (Florida) | 756.27 mi (1,217.09 km) |
| Potomac to Makakilo (Hawaii) | 4,828.67 mi (7,771.00 km) |
| Potomac to Malden (Massachusetts) | 398.55 mi (641.40 km) |
| Potomac to Malibu (California) | 2,314.37 mi (3,724.63 km) |
| Potomac to Maltby (Washington) | 2,299.57 mi (3,700.81 km) |
