| South Portland to Decatur (Alabama) | 1,089.17 mi (1,752.85 km) |
| South Portland to Decatur (Georgia) | 1,014.54 mi (1,632.75 km) |
| South Portland to Decatur (Illinois) | 993.56 mi (1,598.98 km) |
| South Portland to Deer Park (New York) | 251.71 mi (405.09 km) |
| South Portland to Deer Park (Texas) | 1,668.98 mi (2,685.97 km) |
| South Portland to Deerfield (Illinois) | 892.96 mi (1,437.09 km) |
| South Portland to Deerfield Beach (Florida) | 1,318.05 mi (2,121.19 km) |
| South Portland to Defiance (Ohio) | 734.72 mi (1,182.41 km) |
| South Portland to DeForest (Wisconsin) | 954.34 mi (1,535.86 km) |
| South Portland to DeKalb (Illinois) | 941.41 mi (1,515.06 km) |
| South Portland to Del Aire (California) | 2,636.50 mi (4,243.03 km) |
| South Portland to Del City (Oklahoma) | 1,544.59 mi (2,485.78 km) |
| South Portland to Del Rio (Texas) | 1,947.62 mi (3,134.38 km) |
| South Portland to DeLand (Florida) | 1,178.06 mi (1,895.91 km) |
| South Portland to Delano (California) | 2,620.47 mi (4,217.24 km) |
