| Zemst to Oswego (Illinois) | 4,173.11 mi (6,715.97 km) |
| Zemst to Oswego (New York) | 3,639.24 mi (5,856.79 km) |
| Zemst to Otsego (Minnesota) | 4,191.84 mi (6,746.12 km) |
| Zemst to Ottawa (Illinois) | 4,207.04 mi (6,770.58 km) |
| Zemst to Ottawa (Kansas) | 4,581.29 mi (7,372.88 km) |
| Zemst to Ottumwa (Iowa) | 4,356.11 mi (7,010.48 km) |
| Zemst to Overland (Missouri) | 4,394.36 mi (7,072.04 km) |
| Zemst to Overland Park (Kansas) | 4,545.61 mi (7,315.45 km) |
| Zemst to Overlea (Maryland) | 3,820.41 mi (6,148.35 km) |
| Zemst to Oviedo (Florida) | 4,524.89 mi (7,282.11 km) |
| Zemst to Owasso (Oklahoma) | 4,720.47 mi (7,596.86 km) |
| Zemst to Owatonna (Minnesota) | 4,235.10 mi (6,815.74 km) |
| Zemst to Owensboro (Kentucky) | 4,315.86 mi (6,945.71 km) |
| Zemst to Owings Mills (Maryland) | 3,829.32 mi (6,162.70 km) |
| Zemst to Owosso (Michigan) | 3,955.35 mi (6,365.52 km) |
