| River Forest to Orangeburg (South Carolina) | 693.33 mi (1,115.81 km) |
| River Forest to Orangevale (California) | 1,762.96 mi (2,837.20 km) |
| River Forest to Orchards (Washington) | 1,737.04 mi (2,795.50 km) |
| River Forest to Orcutt (California) | 1,819.21 mi (2,927.73 km) |
| River Forest to Oregon (Ohio) | 226.67 mi (364.78 km) |
| River Forest to Oregon (Wisconsin) | 107.14 mi (172.43 km) |
| River Forest to Oregon City (Oregon) | 1,741.80 mi (2,803.16 km) |
| River Forest to Orem (Utah) | 1,244.25 mi (2,002.43 km) |
| River Forest to Orinda (California) | 1,830.12 mi (2,945.29 km) |
| River Forest to Orland Park (Illinois) | 19.98 mi (32.16 km) |
| River Forest to Orlando (Florida) | 995.93 mi (1,602.80 km) |
| River Forest to Ormond Beach (Florida) | 947.85 mi (1,525.42 km) |
| River Forest to Oro Valley (Arizona) | 1,426.99 mi (2,296.52 km) |
| River Forest to Oroville (California) | 1,763.95 mi (2,838.80 km) |
| River Forest to Oshkosh (Wisconsin) | 151.73 mi (244.18 km) |
