| South Portland to Harrison (Ohio) | 807.96 mi (1,300.29 km) |
| South Portland to Harrison (Wisconsin) | 895.23 mi (1,440.73 km) |
| South Portland to Harrisonburg (Virginia) | 573.04 mi (922.22 km) |
| South Portland to Hartford (Connecticut) | 177.13 mi (285.06 km) |
| South Portland to Hartford (Wisconsin) | 905.39 mi (1,457.09 km) |
| South Portland to Hartselle (Alabama) | 1,092.94 mi (1,758.92 km) |
| South Portland to Hartsville (Tennessee) | 974.91 mi (1,568.96 km) |
| South Portland to Harvey (Illinois) | 892.08 mi (1,435.66 km) |
| South Portland to Harvey (Louisiana) | 1,442.38 mi (2,321.29 km) |
| South Portland to Hasbrouck Heights (New Jersey) | 272.12 mi (437.93 km) |
| South Portland to Haslett (Michigan) | 712.62 mi (1,146.85 km) |
| South Portland to Hastings (Minnesota) | 1,117.04 mi (1,797.70 km) |
| South Portland to Hastings (Nebraska) | 1,448.39 mi (2,330.95 km) |
| South Portland to Hattiesburg (Mississippi) | 1,341.05 mi (2,158.20 km) |
| South Portland to Hauppauge (New York) | 244.98 mi (394.26 km) |
