| Gresham to Oswego (Illinois) | 1,713.69 mi (2,757.92 km) |
| Gresham to Oswego (New York) | 2,238.26 mi (3,602.13 km) |
| Gresham to Otsego (Minnesota) | 1,391.17 mi (2,238.87 km) |
| Gresham to Ottawa (Illinois) | 1,698.09 mi (2,732.81 km) |
| Gresham to Ottawa (Kansas) | 1,465.30 mi (2,358.17 km) |
| Gresham to Ottumwa (Iowa) | 1,532.62 mi (2,466.52 km) |
| Gresham to Overland (Missouri) | 1,697.50 mi (2,731.86 km) |
| Gresham to Overland Park (Kansas) | 1,483.78 mi (2,387.91 km) |
| Gresham to Overlea (Maryland) | 2,347.11 mi (3,777.31 km) |
| Gresham to Oviedo (Florida) | 2,518.00 mi (4,052.33 km) |
| Gresham to Owasso (Oklahoma) | 1,519.31 mi (2,445.10 km) |
| Gresham to Owatonna (Minnesota) | 1,427.55 mi (2,297.43 km) |
| Gresham to Owensboro (Kentucky) | 1,884.14 mi (3,032.23 km) |
| Gresham to Owings Mills (Maryland) | 2,332.51 mi (3,753.82 km) |
| Gresham to Owosso (Michigan) | 1,883.76 mi (3,031.62 km) |
