| Forest Grove to Odessa (Texas) | 1,455.87 mi (2,343.00 km) |
| Forest Grove to Ogden (Utah) | 632.61 mi (1,018.09 km) |
| Forest Grove to Oildale (California) | 729.44 mi (1,173.91 km) |
| Forest Grove to Ojus (Florida) | 2,718.14 mi (4,374.42 km) |
| Forest Grove to Okemos (Michigan) | 1,910.69 mi (3,074.96 km) |
| Forest Grove to Oklahoma City (Oklahoma) | 1,504.62 mi (2,421.45 km) |
| Forest Grove to Okmulgee (Oklahoma) | 1,568.48 mi (2,524.22 km) |
| Forest Grove to Olathe (Kansas) | 1,509.78 mi (2,429.76 km) |
| Forest Grove to Old Jamestown (Missouri) | 1,729.57 mi (2,783.48 km) |
| Forest Grove to Oldsmar (Florida) | 2,506.72 mi (4,034.17 km) |
| Forest Grove to Olean (New York) | 2,211.65 mi (3,559.30 km) |
| Forest Grove to Olive Branch (Mississippi) | 1,883.10 mi (3,030.55 km) |
| Forest Grove to Olivehurst (California) | 452.28 mi (727.88 km) |
| Forest Grove to Olney (Maryland) | 2,359.02 mi (3,796.47 km) |
| Forest Grove to Olympia (Washington) | 105.34 mi (169.53 km) |
