| Gresham to Oakley (California) | 520.25 mi (837.26 km) |
| Gresham to Oakton (Virginia) | 2,323.70 mi (3,739.64 km) |
| Gresham to Oakville (Missouri) | 1,707.59 mi (2,748.09 km) |
| Gresham to Oatfield (Oregon) | 9.65 mi (15.53 km) |
| Gresham to Ocala (Florida) | 2,450.05 mi (3,942.98 km) |
| Gresham to Ocean Acres (New Jersey) | 2,443.26 mi (3,932.05 km) |
| Gresham to Ocean City (New Jersey) | 2,442.12 mi (3,930.22 km) |
| Gresham to Ocean Pines (Maryland) | 2,443.14 mi (3,931.86 km) |
| Gresham to Ocean Pointe (Hawaii) | 2,611.07 mi (4,202.11 km) |
| Gresham to Ocean Springs (Mississippi) | 2,087.33 mi (3,359.24 km) |
| Gresham to Oceanside (California) | 891.00 mi (1,433.93 km) |
| Gresham to Oceanside (New York) | 2,448.05 mi (3,939.75 km) |
| Gresham to Ocoee (Florida) | 2,505.10 mi (4,031.57 km) |
| Gresham to Oconomowoc (Wisconsin) | 1,674.22 mi (2,694.40 km) |
| Gresham to Odenton (Maryland) | 2,347.61 mi (3,778.11 km) |
