| Knokke-Heist to Orangevale (California) | 5,373.21 mi (8,647.35 km) |
| Knokke-Heist to Orchards (Washington) | 4,998.08 mi (8,043.62 km) |
| Knokke-Heist to Orcutt (California) | 5,574.26 mi (8,970.91 km) |
| Knokke-Heist to Oregon (Ohio) | 3,933.33 mi (6,330.08 km) |
| Knokke-Heist to Oregon (Wisconsin) | 4,097.62 mi (6,594.48 km) |
| Knokke-Heist to Oregon City (Oregon) | 5,019.99 mi (8,078.90 km) |
| Knokke-Heist to Orem (Utah) | 4,996.42 mi (8,040.96 km) |
| Knokke-Heist to Orinda (California) | 5,447.92 mi (8,767.58 km) |
| Knokke-Heist to Orland Park (Illinois) | 4,103.60 mi (6,604.10 km) |
| Knokke-Heist to Orlando (Florida) | 4,485.99 mi (7,219.51 km) |
| Knokke-Heist to Ormond Beach (Florida) | 4,435.03 mi (7,137.50 km) |
| Knokke-Heist to Oro Valley (Arizona) | 5,413.33 mi (8,711.91 km) |
| Knokke-Heist to Oroville (California) | 5,335.18 mi (8,586.14 km) |
| Knokke-Heist to Oshkosh (Wisconsin) | 4,015.54 mi (6,462.39 km) |
| Knokke-Heist to Oskaloosa (Iowa) | 4,295.60 mi (6,913.10 km) |
