| Rockford to Oak Grove (South Carolina) | 715.26 mi (1,151.10 km) |
| Rockford to Oak Harbor (Washington) | 1,669.98 mi (2,687.58 km) |
| Rockford to Oak Hills (Oregon) | 1,684.17 mi (2,710.40 km) |
| Rockford to Oak Lawn (Illinois) | 77.18 mi (124.20 km) |
| Rockford to Oak Park (California) | 1,695.83 mi (2,729.17 km) |
| Rockford to Oak Park (Illinois) | 70.23 mi (113.02 km) |
| Rockford to Oak Park (Michigan) | 300.55 mi (483.68 km) |
| Rockford to Oak Ridge (Florida) | 1,044.37 mi (1,680.75 km) |
| Rockford to Oak Ridge (New Jersey) | 755.93 mi (1,216.55 km) |
| Rockford to Oak Ridge (Tennessee) | 504.39 mi (811.73 km) |
| Rockford to Oakdale (California) | 1,700.18 mi (2,736.18 km) |
| Rockford to Oakdale (Minnesota) | 271.19 mi (436.44 km) |
| Rockford to Oakland (California) | 1,769.53 mi (2,847.78 km) |
| Rockford to Oakland (New Jersey) | 769.04 mi (1,237.66 km) |
| Rockford to Oakland Park (Florida) | 1,220.48 mi (1,964.17 km) |
