| Potomac to Harrison (Ohio) | 407.13 mi (655.21 km) |
| Potomac to Harrison (Wisconsin) | 675.07 mi (1,086.42 km) |
| Potomac to Harrisonburg (Virginia) | 98.93 mi (159.21 km) |
| Potomac to Hartford (Connecticut) | 304.07 mi (489.36 km) |
| Potomac to Hartford (Wisconsin) | 652.69 mi (1,050.40 km) |
| Potomac to Hartselle (Alabama) | 624.91 mi (1,005.69 km) |
| Potomac to Hartsville (Tennessee) | 522.08 mi (840.20 km) |
| Potomac to Harvey (Illinois) | 578.94 mi (931.72 km) |
| Potomac to Harvey (Louisiana) | 965.42 mi (1,553.69 km) |
| Potomac to Hasbrouck Heights (New Jersey) | 208.83 mi (336.08 km) |
| Potomac to Haslett (Michigan) | 456.33 mi (734.39 km) |
| Potomac to Hastings (Minnesota) | 895.27 mi (1,440.80 km) |
| Potomac to Hastings (Nebraska) | 1,127.60 mi (1,814.70 km) |
| Potomac to Hattiesburg (Mississippi) | 866.08 mi (1,393.83 km) |
| Potomac to Hauppauge (New York) | 245.21 mi (394.63 km) |
