| Wilmington to Oskaloosa (Iowa) | 940.98 mi (1,514.35 km) |
| Wilmington to Oswego (Illinois) | 767.61 mi (1,235.35 km) |
| Wilmington to Oswego (New York) | 642.86 mi (1,034.58 km) |
| Wilmington to Otsego (Minnesota) | 1,128.65 mi (1,816.39 km) |
| Wilmington to Ottawa (Illinois) | 773.89 mi (1,245.45 km) |
| Wilmington to Ottawa (Kansas) | 1,010.96 mi (1,626.98 km) |
| Wilmington to Ottumwa (Iowa) | 922.29 mi (1,484.28 km) |
| Wilmington to Overland (Missouri) | 758.94 mi (1,221.40 km) |
| Wilmington to Overland Park (Kansas) | 985.16 mi (1,585.46 km) |
| Wilmington to Overlea (Maryland) | 364.08 mi (585.93 km) |
| Wilmington to Oviedo (Florida) | 430.05 mi (692.10 km) |
| Wilmington to Owasso (Oklahoma) | 1,021.14 mi (1,643.37 km) |
| Wilmington to Owatonna (Minnesota) | 1,065.58 mi (1,714.89 km) |
| Wilmington to Owensboro (Kentucky) | 570.96 mi (918.87 km) |
| Wilmington to Owings Mills (Maryland) | 364.46 mi (586.54 km) |
