| Forest Grove to Oakley (California) | 525.43 mi (845.59 km) |
| Forest Grove to Oakton (Virginia) | 2,355.79 mi (3,791.28 km) |
| Forest Grove to Oakville (Missouri) | 1,739.96 mi (2,800.20 km) |
| Forest Grove to Oatfield (Oregon) | 26.16 mi (42.09 km) |
| Forest Grove to Ocala (Florida) | 2,481.93 mi (3,994.28 km) |
| Forest Grove to Ocean Acres (New Jersey) | 2,475.06 mi (3,983.22 km) |
| Forest Grove to Ocean City (New Jersey) | 2,474.02 mi (3,981.54 km) |
| Forest Grove to Ocean Pines (Maryland) | 2,475.19 mi (3,983.43 km) |
| Forest Grove to Ocean Pointe (Hawaii) | 2,583.27 mi (4,157.37 km) |
| Forest Grove to Ocean Springs (Mississippi) | 2,118.61 mi (3,409.57 km) |
| Forest Grove to Oceanside (California) | 903.91 mi (1,454.70 km) |
| Forest Grove to Oceanside (New York) | 2,479.64 mi (3,990.59 km) |
| Forest Grove to Ocoee (Florida) | 2,536.96 mi (4,082.84 km) |
| Forest Grove to Oconomowoc (Wisconsin) | 1,706.18 mi (2,745.83 km) |
| Forest Grove to Odenton (Maryland) | 2,379.64 mi (3,829.67 km) |
