| Portage to Oskaloosa (Iowa) | 368.68 mi (593.34 km) |
| Portage to Oswego (Illinois) | 145.59 mi (234.31 km) |
| Portage to Oswego (New York) | 468.43 mi (753.87 km) |
| Portage to Otsego (Minnesota) | 453.10 mi (729.20 km) |
| Portage to Ottawa (Illinois) | 176.61 mi (284.23 km) |
| Portage to Ottawa (Kansas) | 566.04 mi (910.95 km) |
| Portage to Ottumwa (Iowa) | 361.93 mi (582.47 km) |
| Portage to Overland (Missouri) | 348.77 mi (561.28 km) |
| Portage to Overland Park (Kansas) | 529.24 mi (851.74 km) |
| Portage to Overlea (Maryland) | 513.19 mi (825.90 km) |
| Portage to Oviedo (Florida) | 967.57 mi (1,557.15 km) |
| Portage to Owasso (Oklahoma) | 682.65 mi (1,098.63 km) |
| Portage to Owatonna (Minnesota) | 406.55 mi (654.28 km) |
| Portage to Owensboro (Kentucky) | 317.39 mi (510.80 km) |
| Portage to Owings Mills (Maryland) | 498.58 mi (802.39 km) |
