| Rockwall to Odenton (Maryland) | 1,179.64 mi (1,898.44 km) |
| Rockwall to Odessa (Texas) | 351.94 mi (566.40 km) |
| Rockwall to Ogden (Utah) | 1,028.42 mi (1,655.09 km) |
| Rockwall to Oildale (California) | 1,300.24 mi (2,092.54 km) |
| Rockwall to Ojus (Florida) | 1,089.36 mi (1,753.15 km) |
| Rockwall to Okemos (Michigan) | 940.57 mi (1,513.70 km) |
| Rockwall to Oklahoma City (Oklahoma) | 186.66 mi (300.39 km) |
| Rockwall to Okmulgee (Oklahoma) | 187.92 mi (302.44 km) |
| Rockwall to Olathe (Kansas) | 422.04 mi (679.20 km) |
| Rockwall to Old Jamestown (Missouri) | 534.59 mi (860.34 km) |
| Rockwall to Oldsmar (Florida) | 885.10 mi (1,424.43 km) |
| Rockwall to Olean (New York) | 1,168.92 mi (1,881.19 km) |
| Rockwall to Olive Branch (Mississippi) | 403.21 mi (648.91 km) |
| Rockwall to Olivehurst (California) | 1,461.83 mi (2,352.59 km) |
| Rockwall to Olney (Maryland) | 1,161.58 mi (1,869.39 km) |
