| Gresham to Odessa (Texas) | 1,428.10 mi (2,298.30 km) |
| Gresham to Ogden (Utah) | 602.60 mi (969.79 km) |
| Gresham to Oildale (California) | 718.50 mi (1,156.31 km) |
| Gresham to Ojus (Florida) | 2,686.51 mi (4,323.52 km) |
| Gresham to Okemos (Michigan) | 1,878.86 mi (3,023.73 km) |
| Gresham to Oklahoma City (Oklahoma) | 1,473.50 mi (2,371.37 km) |
| Gresham to Okmulgee (Oklahoma) | 1,537.04 mi (2,473.63 km) |
| Gresham to Olathe (Kansas) | 1,477.52 mi (2,377.83 km) |
| Gresham to Old Jamestown (Missouri) | 1,697.18 mi (2,731.35 km) |
| Gresham to Oldsmar (Florida) | 2,475.06 mi (3,983.22 km) |
| Gresham to Olean (New York) | 2,180.04 mi (3,508.43 km) |
| Gresham to Olive Branch (Mississippi) | 1,851.06 mi (2,979.00 km) |
| Gresham to Olivehurst (California) | 446.05 mi (717.85 km) |
| Gresham to Olney (Maryland) | 2,326.97 mi (3,744.90 km) |
| Gresham to Olympia (Washington) | 108.57 mi (174.72 km) |
