| Normal to Oswego (Illinois) | 87.13 mi (140.22 km) |
| Normal to Oswego (New York) | 671.76 mi (1,081.10 km) |
| Normal to Otsego (Minnesota) | 402.86 mi (648.33 km) |
| Normal to Ottawa (Illinois) | 58.23 mi (93.71 km) |
| Normal to Ottawa (Kansas) | 359.57 mi (578.68 km) |
| Normal to Ottumwa (Iowa) | 182.74 mi (294.10 km) |
| Normal to Overland (Missouri) | 145.95 mi (234.88 km) |
| Normal to Overland Park (Kansas) | 323.21 mi (520.16 km) |
| Normal to Overlea (Maryland) | 664.87 mi (1,070.01 km) |
| Normal to Oviedo (Florida) | 931.13 mi (1,498.51 km) |
| Normal to Owasso (Oklahoma) | 471.80 mi (759.29 km) |
| Normal to Owatonna (Minnesota) | 328.28 mi (528.31 km) |
| Normal to Owensboro (Kentucky) | 215.70 mi (347.13 km) |
| Normal to Owings Mills (Maryland) | 649.90 mi (1,045.91 km) |
| Normal to Owosso (Michigan) | 301.14 mi (484.64 km) |
