| South Portland to Delaware (Ohio) | 695.49 mi (1,119.28 km) |
| South Portland to Delhi (California) | 2,644.29 mi (4,255.57 km) |
| South Portland to Delray Beach (Florida) | 1,307.58 mi (2,104.35 km) |
| South Portland to Deltona (Florida) | 1,183.15 mi (1,904.09 km) |
| South Portland to Deming (New Mexico) | 2,165.01 mi (3,484.25 km) |
| South Portland to Denison (Texas) | 1,563.93 mi (2,516.91 km) |
| South Portland to Dent (Ohio) | 804.00 mi (1,293.91 km) |
| South Portland to Denton (Texas) | 1,611.97 mi (2,594.21 km) |
| South Portland to Dentsville (South Carolina) | 873.26 mi (1,405.38 km) |
| South Portland to Denver (Colorado) | 1,791.02 mi (2,882.37 km) |
| South Portland to Depew (New York) | 426.05 mi (685.66 km) |
| South Portland to Derby (Connecticut) | 213.56 mi (343.70 km) |
| South Portland to Derby (Kansas) | 1,468.28 mi (2,362.97 km) |
| South Portland to Des Moines (Iowa) | 1,190.58 mi (1,916.05 km) |
| South Portland to Des Moines (Washington) | 2,485.15 mi (3,999.47 km) |
