| Round Lake Beach to Decatur (Alabama) | 542.54 mi (873.14 km) |
| Round Lake Beach to Decatur (Georgia) | 629.19 mi (1,012.58 km) |
| Round Lake Beach to Decatur (Illinois) | 179.91 mi (289.54 km) |
| Round Lake Beach to Deer Park (New York) | 770.06 mi (1,239.29 km) |
| Round Lake Beach to Deer Park (Texas) | 959.91 mi (1,544.83 km) |
| Round Lake Beach to Deerfield (Illinois) | 18.86 mi (30.35 km) |
| Round Lake Beach to Deerfield Beach (Florida) | 1,198.32 mi (1,928.51 km) |
| Round Lake Beach to Defiance (Ohio) | 205.75 mi (331.12 km) |
| Round Lake Beach to DeForest (Wisconsin) | 86.89 mi (139.83 km) |
| Round Lake Beach to DeKalb (Illinois) | 46.09 mi (74.17 km) |
| Round Lake Beach to Del Aire (California) | 1,735.48 mi (2,792.98 km) |
| Round Lake Beach to Del City (Oklahoma) | 693.82 mi (1,116.59 km) |
| Round Lake Beach to Del Rio (Texas) | 1,146.68 mi (1,845.40 km) |
| Round Lake Beach to DeLand (Florida) | 997.60 mi (1,605.49 km) |
| Round Lake Beach to Delano (California) | 1,723.19 mi (2,773.21 km) |
