| South Portland to Dallas (Oregon) | 2,576.95 mi (4,147.20 km) |
| South Portland to Dallas (Texas) | 1,610.88 mi (2,592.46 km) |
| South Portland to Dalton (Georgia) | 993.93 mi (1,599.58 km) |
| South Portland to Daly City (California) | 2,720.22 mi (4,377.76 km) |
| South Portland to Damascus (Maryland) | 467.36 mi (752.15 km) |
| South Portland to Damascus (Oregon) | 2,526.37 mi (4,065.79 km) |
| South Portland to Dana Point (California) | 2,617.99 mi (4,213.26 km) |
| South Portland to Danbury (Connecticut) | 223.53 mi (359.74 km) |
| South Portland to Dania Beach (Florida) | 1,334.61 mi (2,147.85 km) |
| South Portland to Danville (California) | 2,691.88 mi (4,332.17 km) |
| South Portland to Danville (Illinois) | 921.09 mi (1,482.34 km) |
| South Portland to Danville (Indiana) | 876.49 mi (1,410.58 km) |
| South Portland to Danville (Kentucky) | 863.31 mi (1,389.37 km) |
| South Portland to Danville (Virginia) | 684.29 mi (1,101.26 km) |
| South Portland to Daphne (Alabama) | 1,316.36 mi (2,118.48 km) |
