| Portage to Odenton (Maryland) | 513.95 mi (827.13 km) |
| Portage to Odessa (Texas) | 1,163.50 mi (1,872.48 km) |
| Portage to Ogden (Utah) | 1,356.70 mi (2,183.39 km) |
| Portage to Oildale (California) | 1,847.16 mi (2,972.71 km) |
| Portage to Ojus (Florida) | 1,163.88 mi (1,873.09 km) |
| Portage to Okemos (Michigan) | 69.44 mi (111.75 km) |
| Portage to Oklahoma City (Oklahoma) | 791.32 mi (1,273.51 km) |
| Portage to Okmulgee (Oklahoma) | 720.69 mi (1,159.83 km) |
| Portage to Olathe (Kansas) | 535.66 mi (862.06 km) |
| Portage to Old Jamestown (Missouri) | 338.57 mi (544.88 km) |
| Portage to Oldsmar (Florida) | 991.29 mi (1,595.33 km) |
| Portage to Olean (New York) | 366.73 mi (590.20 km) |
| Portage to Olive Branch (Mississippi) | 550.28 mi (885.58 km) |
| Portage to Olivehurst (California) | 1,883.89 mi (3,031.83 km) |
| Portage to Olney (Maryland) | 493.46 mi (794.14 km) |
