| Rockwall to Orangeburg (South Carolina) | 900.18 mi (1,448.70 km) |
| Rockwall to Orangevale (California) | 1,439.86 mi (2,317.23 km) |
| Rockwall to Orchards (Washington) | 1,639.21 mi (2,638.05 km) |
| Rockwall to Orcutt (California) | 1,378.90 mi (2,219.12 km) |
| Rockwall to Oregon (Ohio) | 933.76 mi (1,502.74 km) |
| Rockwall to Oregon (Wisconsin) | 790.34 mi (1,271.93 km) |
| Rockwall to Oregon City (Oregon) | 1,632.59 mi (2,627.39 km) |
| Rockwall to Orem (Utah) | 986.15 mi (1,587.05 km) |
| Rockwall to Orinda (California) | 1,484.65 mi (2,389.32 km) |
| Rockwall to Orland Park (Illinois) | 762.63 mi (1,227.34 km) |
| Rockwall to Orlando (Florida) | 947.05 mi (1,524.13 km) |
| Rockwall to Ormond Beach (Florida) | 940.05 mi (1,512.87 km) |
| Rockwall to Oro Valley (Arizona) | 845.68 mi (1,360.98 km) |
| Rockwall to Oroville (California) | 1,467.07 mi (2,361.02 km) |
| Rockwall to Oshkosh (Wisconsin) | 876.67 mi (1,410.86 km) |
