| Lake in the Hills to Oakley (California) | 1,774.77 mi (2,856.22 km) |
| Lake in the Hills to Oakton (Virginia) | 622.68 mi (1,002.11 km) |
| Lake in the Hills to Oakville (Missouri) | 278.71 mi (448.54 km) |
| Lake in the Hills to Oatfield (Oregon) | 1,709.09 mi (2,750.51 km) |
| Lake in the Hills to Ocala (Florida) | 963.33 mi (1,550.33 km) |
| Lake in the Hills to Ocean Acres (New Jersey) | 752.20 mi (1,210.54 km) |
| Lake in the Hills to Ocean City (New Jersey) | 746.56 mi (1,201.47 km) |
| Lake in the Hills to Ocean Pines (Maryland) | 742.71 mi (1,195.28 km) |
| Lake in the Hills to Ocean Pointe (Hawaii) | 4,219.27 mi (6,790.26 km) |
| Lake in the Hills to Ocean Springs (Mississippi) | 814.50 mi (1,310.80 km) |
| Lake in the Hills to Oceanside (California) | 1,689.77 mi (2,719.43 km) |
| Lake in the Hills to Oceanside (New York) | 768.89 mi (1,237.41 km) |
| Lake in the Hills to Ocoee (Florida) | 1,014.91 mi (1,633.34 km) |
| Lake in the Hills to Oconomowoc (Wisconsin) | 63.20 mi (101.71 km) |
| Lake in the Hills to Odenton (Maryland) | 647.48 mi (1,042.02 km) |
