| DeForest to Oswego (Illinois) | 118.53 mi (190.75 km) |
| DeForest to Oswego (New York) | 644.89 mi (1,037.85 km) |
| DeForest to Otsego (Minnesota) | 254.10 mi (408.94 km) |
| DeForest to Ottawa (Illinois) | 132.19 mi (212.74 km) |
| DeForest to Ottawa (Kansas) | 444.65 mi (715.59 km) |
| DeForest to Ottumwa (Iowa) | 219.44 mi (353.16 km) |
| DeForest to Overland (Missouri) | 317.77 mi (511.40 km) |
| DeForest to Overland Park (Kansas) | 409.16 mi (658.49 km) |
| DeForest to Overlea (Maryland) | 716.40 mi (1,152.94 km) |
| DeForest to Oviedo (Florida) | 1,104.01 mi (1,776.72 km) |
| DeForest to Owasso (Oklahoma) | 590.20 mi (949.84 km) |
| DeForest to Owatonna (Minnesota) | 203.23 mi (327.06 km) |
| DeForest to Owensboro (Kentucky) | 395.75 mi (636.90 km) |
| DeForest to Owings Mills (Maryland) | 701.83 mi (1,129.49 km) |
| DeForest to Owosso (Michigan) | 261.08 mi (420.17 km) |
