| Manassas to Oakley (California) | 2,371.78 mi (3,817.00 km) |
| Manassas to Oakton (Virginia) | 13.81 mi (22.23 km) |
| Manassas to Oakville (Missouri) | 692.88 mi (1,115.09 km) |
| Manassas to Oatfield (Oregon) | 2,327.12 mi (3,745.13 km) |
| Manassas to Ocala (Florida) | 712.98 mi (1,147.43 km) |
| Manassas to Ocean Acres (New Jersey) | 184.67 mi (297.19 km) |
| Manassas to Ocean City (New Jersey) | 158.83 mi (255.62 km) |
| Manassas to Ocean Pines (Maryland) | 128.61 mi (206.98 km) |
| Manassas to Ocean Pointe (Hawaii) | 4,816.13 mi (7,750.82 km) |
| Manassas to Ocean Springs (Mississippi) | 862.11 mi (1,387.43 km) |
| Manassas to Oceanside (California) | 2,241.02 mi (3,606.57 km) |
| Manassas to Oceanside (New York) | 242.46 mi (390.20 km) |
| Manassas to Ocoee (Florida) | 739.92 mi (1,190.79 km) |
| Manassas to Oconomowoc (Wisconsin) | 647.99 mi (1,042.83 km) |
| Manassas to Odenton (Maryland) | 47.83 mi (76.97 km) |
