| Potomac to Merriam (Kansas) | 937.95 mi (1,509.48 km) |
| Potomac to Merrick (New York) | 223.83 mi (360.23 km) |
| Potomac to Merrifield (Virginia) | 10.08 mi (16.23 km) |
| Potomac to Merrillville (Indiana) | 559.97 mi (901.19 km) |
| Potomac to Merritt Island (Florida) | 765.69 mi (1,232.25 km) |
| Potomac to Mesa (Arizona) | 1,951.20 mi (3,140.15 km) |
| Potomac to Mesquite (Nevada) | 2,005.66 mi (3,227.80 km) |
| Potomac to Mesquite (Texas) | 1,165.41 mi (1,875.55 km) |
| Potomac to Metairie (Louisiana) | 964.94 mi (1,552.93 km) |
| Potomac to Methuen Town (Massachusetts) | 405.40 mi (652.43 km) |
| Potomac to Metuchen (New Jersey) | 183.71 mi (295.66 km) |
| Potomac to Mexico (Missouri) | 786.31 mi (1,265.44 km) |
| Potomac to Miami (Florida) | 930.72 mi (1,497.85 km) |
| Potomac to Miami (Oklahoma) | 972.63 mi (1,565.30 km) |
| Potomac to Miami Beach (Florida) | 927.71 mi (1,493.00 km) |
