| Parker to Odenton (Maryland) | 1,495.91 mi (2,407.43 km) |
| Parker to Odessa (Texas) | 544.36 mi (876.06 km) |
| Parker to Ogden (Utah) | 396.71 mi (638.44 km) |
| Parker to Oildale (California) | 829.86 mi (1,335.52 km) |
| Parker to Ojus (Florida) | 1,700.80 mi (2,737.18 km) |
| Parker to Okemos (Michigan) | 1,080.00 mi (1,738.10 km) |
| Parker to Oklahoma City (Oklahoma) | 485.99 mi (782.12 km) |
| Parker to Okmulgee (Oklahoma) | 550.14 mi (885.37 km) |
| Parker to Olathe (Kansas) | 534.54 mi (860.27 km) |
| Parker to Old Jamestown (Missouri) | 776.70 mi (1,249.98 km) |
| Parker to Oldsmar (Florida) | 1,489.80 mi (2,397.59 km) |
| Parker to Olean (New York) | 1,383.79 mi (2,227.00 km) |
| Parker to Olive Branch (Mississippi) | 877.91 mi (1,412.86 km) |
| Parker to Olivehurst (California) | 896.52 mi (1,442.81 km) |
| Parker to Olney (Maryland) | 1,475.00 mi (2,373.78 km) |
