| Knokke-Heist to Oakley (California) | 5,427.59 mi (8,734.86 km) |
| Knokke-Heist to Oakton (Virginia) | 3,818.57 mi (6,145.39 km) |
| Knokke-Heist to Oakville (Missouri) | 4,349.38 mi (6,999.65 km) |
| Knokke-Heist to Oatfield (Oregon) | 5,015.89 mi (8,072.30 km) |
| Knokke-Heist to Ocala (Florida) | 4,484.68 mi (7,217.39 km) |
| Knokke-Heist to Ocean Acres (New Jersey) | 3,657.74 mi (5,886.56 km) |
| Knokke-Heist to Ocean City (New Jersey) | 3,692.04 mi (5,941.76 km) |
| Knokke-Heist to Ocean Pines (Maryland) | 3,754.18 mi (6,041.78 km) |
| Knokke-Heist to Ocean Pointe (Hawaii) | 7,290.17 mi (11,732.40 km) |
| Knokke-Heist to Ocean Springs (Mississippi) | 4,693.41 mi (7,553.32 km) |
| Knokke-Heist to Oceanside (California) | 5,574.66 mi (8,971.54 km) |
| Knokke-Heist to Oceanside (New York) | 3,592.27 mi (5,781.20 km) |
| Knokke-Heist to Ocoee (Florida) | 4,489.03 mi (7,224.40 km) |
| Knokke-Heist to Oconomowoc (Wisconsin) | 4,056.46 mi (6,528.25 km) |
| Knokke-Heist to Odenton (Maryland) | 3,785.95 mi (6,092.90 km) |
