| Lake in the Hills to Orangevale (California) | 1,734.63 mi (2,791.62 km) |
| Lake in the Hills to Orchards (Washington) | 1,704.53 mi (2,743.17 km) |
| Lake in the Hills to Orcutt (California) | 1,794.05 mi (2,887.25 km) |
| Lake in the Hills to Oregon (Ohio) | 255.40 mi (411.02 km) |
| Lake in the Hills to Oregon (Wisconsin) | 73.36 mi (118.06 km) |
| Lake in the Hills to Oregon City (Oregon) | 1,709.43 mi (2,751.06 km) |
| Lake in the Hills to Orem (Utah) | 1,216.34 mi (1,957.51 km) |
| Lake in the Hills to Orinda (California) | 1,802.19 mi (2,900.34 km) |
| Lake in the Hills to Orland Park (Illinois) | 47.45 mi (76.36 km) |
| Lake in the Hills to Orlando (Florida) | 1,025.70 mi (1,650.70 km) |
| Lake in the Hills to Ormond Beach (Florida) | 978.16 mi (1,574.20 km) |
| Lake in the Hills to Oro Valley (Arizona) | 1,408.76 mi (2,267.18 km) |
| Lake in the Hills to Oroville (California) | 1,734.99 mi (2,792.19 km) |
| Lake in the Hills to Oshkosh (Wisconsin) | 127.00 mi (204.38 km) |
| Lake in the Hills to Oskaloosa (Iowa) | 229.83 mi (369.88 km) |
