| Wilmington to Odenton (Maryland) | 341.98 mi (550.36 km) |
| Wilmington to Odessa (Texas) | 1,422.22 mi (2,288.85 km) |
| Wilmington to Ogden (Utah) | 1,911.46 mi (3,076.19 km) |
| Wilmington to Oildale (California) | 2,318.31 mi (3,730.96 km) |
| Wilmington to Ojus (Florida) | 586.20 mi (943.39 km) |
| Wilmington to Okemos (Michigan) | 684.52 mi (1,101.62 km) |
| Wilmington to Oklahoma City (Oklahoma) | 1,114.58 mi (1,793.74 km) |
| Wilmington to Okmulgee (Oklahoma) | 1,029.77 mi (1,657.26 km) |
| Wilmington to Olathe (Kansas) | 992.04 mi (1,596.54 km) |
| Wilmington to Old Jamestown (Missouri) | 758.19 mi (1,220.19 km) |
| Wilmington to Oldsmar (Florida) | 510.84 mi (822.13 km) |
| Wilmington to Olean (New York) | 544.71 mi (876.62 km) |
| Wilmington to Olive Branch (Mississippi) | 681.91 mi (1,097.42 km) |
| Wilmington to Olivehurst (California) | 2,420.85 mi (3,895.98 km) |
| Wilmington to Olney (Maryland) | 344.06 mi (553.71 km) |
