| Mackworth to Odessa (Texas) | 4,906.29 mi (7,895.92 km) |
| Mackworth to Ogden (Utah) | 4,728.30 mi (7,609.46 km) |
| Mackworth to Oildale (California) | 5,276.18 mi (8,491.19 km) |
| Mackworth to Ojus (Florida) | 4,343.34 mi (6,989.93 km) |
| Mackworth to Okemos (Michigan) | 3,690.29 mi (5,938.95 km) |
| Mackworth to Oklahoma City (Oklahoma) | 4,538.00 mi (7,303.21 km) |
| Mackworth to Okmulgee (Oklahoma) | 4,474.43 mi (7,200.90 km) |
| Mackworth to Olathe (Kansas) | 4,263.52 mi (6,861.48 km) |
| Mackworth to Old Jamestown (Missouri) | 4,096.77 mi (6,593.11 km) |
| Mackworth to Oldsmar (Florida) | 4,338.56 mi (6,982.23 km) |
| Mackworth to Olean (New York) | 3,488.72 mi (5,614.55 km) |
| Mackworth to Olive Branch (Mississippi) | 4,273.47 mi (6,877.48 km) |
| Mackworth to Olivehurst (California) | 5,140.76 mi (8,273.26 km) |
| Mackworth to Olney (Maryland) | 3,568.55 mi (5,743.02 km) |
| Mackworth to Olympia (Washington) | 4,717.37 mi (7,591.87 km) |
