| Round Lake Beach to Orangeburg (South Carolina) | 728.40 mi (1,172.24 km) |
| Round Lake Beach to Orangevale (California) | 1,747.57 mi (2,812.44 km) |
| Round Lake Beach to Orchards (Washington) | 1,712.97 mi (2,756.77 km) |
| Round Lake Beach to Orcutt (California) | 1,808.91 mi (2,911.17 km) |
| Round Lake Beach to Oregon (Ohio) | 243.84 mi (392.42 km) |
| Round Lake Beach to Oregon (Wisconsin) | 76.44 mi (123.01 km) |
| Round Lake Beach to Oregon City (Oregon) | 1,718.12 mi (2,765.04 km) |
| Round Lake Beach to Orem (Utah) | 1,229.63 mi (1,978.90 km) |
| Round Lake Beach to Orinda (California) | 1,815.40 mi (2,921.61 km) |
| Round Lake Beach to Orland Park (Illinois) | 54.49 mi (87.69 km) |
| Round Lake Beach to Orlando (Florida) | 1,031.95 mi (1,660.77 km) |
| Round Lake Beach to Ormond Beach (Florida) | 983.81 mi (1,583.29 km) |
| Round Lake Beach to Oro Valley (Arizona) | 1,426.16 mi (2,295.19 km) |
| Round Lake Beach to Oroville (California) | 1,747.44 mi (2,812.23 km) |
| Round Lake Beach to Oshkosh (Wisconsin) | 116.11 mi (186.87 km) |
