| Rockford to Orangeburg (South Carolina) | 752.01 mi (1,210.25 km) |
| Rockford to Orangevale (California) | 1,697.80 mi (2,732.34 km) |
| Rockford to Orchards (Washington) | 1,668.44 mi (2,685.10 km) |
| Rockford to Orcutt (California) | 1,758.11 mi (2,829.40 km) |
| Rockford to Oregon (Ohio) | 292.35 mi (470.49 km) |
| Rockford to Oregon (Wisconsin) | 48.88 mi (78.66 km) |
| Rockford to Oregon City (Oregon) | 1,673.24 mi (2,692.81 km) |
| Rockford to Orem (Utah) | 1,179.59 mi (1,898.37 km) |
| Rockford to Orinda (California) | 1,765.42 mi (2,841.17 km) |
| Rockford to Orland Park (Illinois) | 76.47 mi (123.07 km) |
| Rockford to Orlando (Florida) | 1,045.92 mi (1,683.24 km) |
| Rockford to Ormond Beach (Florida) | 999.44 mi (1,608.45 km) |
| Rockford to Oro Valley (Arizona) | 1,376.49 mi (2,215.24 km) |
| Rockford to Oroville (California) | 1,698.07 mi (2,732.78 km) |
| Rockford to Oshkosh (Wisconsin) | 124.42 mi (200.23 km) |
