| Gronau to Oswego (Illinois) | 4,224.43 mi (6,798.57 km) |
| Gronau to Oswego (New York) | 3,702.79 mi (5,959.06 km) |
| Gronau to Otsego (Minnesota) | 4,229.11 mi (6,806.10 km) |
| Gronau to Ottawa (Illinois) | 4,258.30 mi (6,853.07 km) |
| Gronau to Ottawa (Kansas) | 4,628.16 mi (7,448.31 km) |
| Gronau to Ottumwa (Iowa) | 4,402.91 mi (7,085.80 km) |
| Gronau to Overland (Missouri) | 4,448.21 mi (7,158.70 km) |
| Gronau to Overland Park (Kansas) | 4,592.84 mi (7,391.47 km) |
| Gronau to Overlea (Maryland) | 3,892.17 mi (6,263.84 km) |
| Gronau to Oviedo (Florida) | 4,608.18 mi (7,416.15 km) |
| Gronau to Owasso (Oklahoma) | 4,770.31 mi (7,677.06 km) |
| Gronau to Owatonna (Minnesota) | 4,275.13 mi (6,880.15 km) |
| Gronau to Owensboro (Kentucky) | 4,376.00 mi (7,042.50 km) |
| Gronau to Owings Mills (Maryland) | 3,900.63 mi (6,277.45 km) |
| Gronau to Owosso (Michigan) | 4,009.81 mi (6,453.16 km) |
