| Rockford to Oakleaf Plantation (Florida) | 926.65 mi (1,491.29 km) |
| Rockford to Oakley (California) | 1,738.01 mi (2,797.05 km) |
| Rockford to Oakton (Virginia) | 659.08 mi (1,060.69 km) |
| Rockford to Oakville (Missouri) | 271.53 mi (436.98 km) |
| Rockford to Oatfield (Oregon) | 1,672.92 mi (2,692.30 km) |
| Rockford to Ocala (Florida) | 982.65 mi (1,581.42 km) |
| Rockford to Ocean Acres (New Jersey) | 789.14 mi (1,270.01 km) |
| Rockford to Ocean City (New Jersey) | 783.44 mi (1,260.83 km) |
| Rockford to Ocean Pines (Maryland) | 779.25 mi (1,254.09 km) |
| Rockford to Ocean Pointe (Hawaii) | 4,182.42 mi (6,730.95 km) |
| Rockford to Ocean Springs (Mississippi) | 819.00 mi (1,318.05 km) |
| Rockford to Oceanside (California) | 1,654.99 mi (2,663.45 km) |
| Rockford to Oceanside (New York) | 805.73 mi (1,296.71 km) |
| Rockford to Ocoee (Florida) | 1,034.87 mi (1,665.46 km) |
| Rockford to Oconomowoc (Wisconsin) | 64.84 mi (104.35 km) |
