| Manassas to Odessa (Texas) | 1,474.28 mi (2,372.62 km) |
| Manassas to Ogden (Utah) | 1,821.56 mi (2,931.52 km) |
| Manassas to Oildale (California) | 2,281.74 mi (3,672.10 km) |
| Manassas to Ojus (Florida) | 897.39 mi (1,444.21 km) |
| Manassas to Okemos (Michigan) | 454.09 mi (730.79 km) |
| Manassas to Oklahoma City (Oklahoma) | 1,124.29 mi (1,809.38 km) |
| Manassas to Okmulgee (Oklahoma) | 1,040.48 mi (1,674.49 km) |
| Manassas to Olathe (Kansas) | 931.94 mi (1,499.81 km) |
| Manassas to Old Jamestown (Missouri) | 688.82 mi (1,108.54 km) |
| Manassas to Oldsmar (Florida) | 796.97 mi (1,282.59 km) |
| Manassas to Olean (New York) | 235.69 mi (379.31 km) |
| Manassas to Olive Branch (Mississippi) | 731.11 mi (1,176.61 km) |
| Manassas to Olivehurst (California) | 2,345.68 mi (3,775.00 km) |
| Manassas to Olney (Maryland) | 35.35 mi (56.88 km) |
| Manassas to Olympia (Washington) | 2,334.09 mi (3,756.36 km) |
