| Duffel to Oakley (California) | 5,474.97 mi (8,811.12 km) |
| Duffel to Oakton (Virginia) | 3,874.21 mi (6,234.94 km) |
| Duffel to Oakville (Missouri) | 4,404.00 mi (7,087.55 km) |
| Duffel to Oatfield (Oregon) | 5,060.77 mi (8,144.53 km) |
| Duffel to Ocala (Florida) | 4,540.44 mi (7,307.14 km) |
| Duffel to Ocean Acres (New Jersey) | 3,713.44 mi (5,976.20 km) |
| Duffel to Ocean City (New Jersey) | 3,747.75 mi (6,031.42 km) |
| Duffel to Ocean Pines (Maryland) | 3,809.92 mi (6,131.47 km) |
| Duffel to Ocean Pointe (Hawaii) | 7,322.06 mi (11,783.71 km) |
| Duffel to Ocean Springs (Mississippi) | 4,749.00 mi (7,642.78 km) |
| Duffel to Oceanside (California) | 5,624.70 mi (9,052.08 km) |
| Duffel to Oceanside (New York) | 3,647.95 mi (5,870.80 km) |
| Duffel to Ocoee (Florida) | 4,544.78 mi (7,314.11 km) |
| Duffel to Oconomowoc (Wisconsin) | 4,110.49 mi (6,615.20 km) |
| Duffel to Odenton (Maryland) | 3,841.60 mi (6,182.46 km) |
