| South Portland to Dixon (California) | 2,666.18 mi (4,290.80 km) |
| South Portland to Dixon (Illinois) | 979.40 mi (1,576.19 km) |
| South Portland to Dobbs Ferry (New York) | 257.20 mi (413.93 km) |
| South Portland to Doctor Phillips (Florida) | 1,218.96 mi (1,961.73 km) |
| South Portland to Dodge City (Kansas) | 1,599.86 mi (2,574.73 km) |
| South Portland to Dolton (Illinois) | 889.01 mi (1,430.72 km) |
| South Portland to Donna (Texas) | 1,967.76 mi (3,166.80 km) |
| South Portland to Dorado (Puerto Rico) | 1,754.39 mi (2,823.42 km) |
| South Portland to Doral (Florida) | 1,354.75 mi (2,180.25 km) |
| South Portland to Doraville (Georgia) | 1,006.76 mi (1,620.22 km) |
| South Portland to Dothan (Alabama) | 1,188.60 mi (1,912.86 km) |
| South Portland to Douglas (Arizona) | 2,287.01 mi (3,680.59 km) |
| South Portland to Douglas (Georgia) | 1,081.51 mi (1,740.52 km) |
| South Portland to Douglasville (Georgia) | 1,032.50 mi (1,661.65 km) |
| South Portland to Dover (Delaware) | 410.78 mi (661.09 km) |
