| Parker to Oskaloosa (Iowa) | 649.71 mi (1,045.61 km) |
| Parker to Oswego (Illinois) | 874.00 mi (1,406.56 km) |
| Parker to Oswego (New York) | 1,481.31 mi (2,383.94 km) |
| Parker to Otsego (Minnesota) | 693.48 mi (1,116.05 km) |
| Parker to Ottawa (Illinois) | 847.21 mi (1,363.46 km) |
| Parker to Ottawa (Kansas) | 513.95 mi (827.12 km) |
| Parker to Ottumwa (Iowa) | 659.22 mi (1,060.91 km) |
| Parker to Overland (Missouri) | 773.64 mi (1,245.06 km) |
| Parker to Overland Park (Kansas) | 541.60 mi (871.62 km) |
| Parker to Overlea (Maryland) | 1,501.70 mi (2,416.75 km) |
| Parker to Oviedo (Florida) | 1,537.18 mi (2,473.85 km) |
| Parker to Owasso (Oklahoma) | 535.69 mi (862.11 km) |
| Parker to Owatonna (Minnesota) | 672.79 mi (1,082.75 km) |
| Parker to Owensboro (Kentucky) | 959.13 mi (1,543.58 km) |
| Parker to Owings Mills (Maryland) | 1,486.74 mi (2,392.68 km) |
