| Middle River to Oakley (California) | 2,418.10 mi (3,891.55 km) |
| Middle River to Oakton (Virginia) | 56.52 mi (90.96 km) |
| Middle River to Oakville (Missouri) | 748.99 mi (1,205.38 km) |
| Middle River to Oatfield (Oregon) | 2,360.21 mi (3,798.39 km) |
| Middle River to Ocala (Florida) | 774.30 mi (1,246.11 km) |
| Middle River to Ocean Acres (New Jersey) | 117.56 mi (189.19 km) |
| Middle River to Ocean City (New Jersey) | 97.62 mi (157.10 km) |
| Middle River to Ocean Pines (Maryland) | 95.41 mi (153.54 km) |
| Middle River to Ocean Pointe (Hawaii) | 4,863.37 mi (7,826.84 km) |
| Middle River to Ocean Springs (Mississippi) | 932.20 mi (1,500.23 km) |
| Middle River to Oceanside (California) | 2,295.94 mi (3,694.96 km) |
| Middle River to Oceanside (New York) | 172.41 mi (277.47 km) |
| Middle River to Ocoee (Florida) | 798.87 mi (1,285.65 km) |
| Middle River to Oconomowoc (Wisconsin) | 678.00 mi (1,091.14 km) |
| Middle River to Odenton (Maryland) | 23.96 mi (38.57 km) |
