| DeKalb to Oswego (Illinois) | 27.23 mi (43.82 km) |
| DeKalb to Oswego (New York) | 630.19 mi (1,014.20 km) |
| DeKalb to Otsego (Minnesota) | 335.31 mi (539.63 km) |
| DeKalb to Ottawa (Illinois) | 39.99 mi (64.36 km) |
| DeKalb to Ottawa (Kansas) | 413.32 mi (665.18 km) |
| DeKalb to Ottumwa (Iowa) | 200.17 mi (322.14 km) |
| DeKalb to Overland (Missouri) | 239.25 mi (385.03 km) |
| DeKalb to Overland Park (Kansas) | 376.51 mi (605.93 km) |
| DeKalb to Overlea (Maryland) | 664.58 mi (1,069.54 km) |
| DeKalb to Oviedo (Florida) | 1,010.32 mi (1,625.96 km) |
| DeKalb to Owasso (Oklahoma) | 543.90 mi (875.32 km) |
| DeKalb to Owatonna (Minnesota) | 271.17 mi (436.41 km) |
| DeKalb to Owensboro (Kentucky) | 301.07 mi (484.52 km) |
| DeKalb to Owings Mills (Maryland) | 649.71 mi (1,045.60 km) |
| DeKalb to Owosso (Michigan) | 244.33 mi (393.21 km) |
