| Manassas to Oswego (Illinois) | 606.97 mi (976.83 km) |
| Manassas to Oswego (New York) | 328.99 mi (529.47 km) |
| Manassas to Otsego (Minnesota) | 940.52 mi (1,513.61 km) |
| Manassas to Ottawa (Illinois) | 625.80 mi (1,007.13 km) |
| Manassas to Ottawa (Kansas) | 957.63 mi (1,541.15 km) |
| Manassas to Ottumwa (Iowa) | 806.16 mi (1,297.39 km) |
| Manassas to Overland (Missouri) | 694.02 mi (1,116.91 km) |
| Manassas to Overland Park (Kansas) | 924.79 mi (1,488.31 km) |
| Manassas to Overlea (Maryland) | 67.09 mi (107.97 km) |
| Manassas to Oviedo (Florida) | 728.73 mi (1,172.78 km) |
| Manassas to Owasso (Oklahoma) | 1,017.95 mi (1,638.23 km) |
| Manassas to Owatonna (Minnesota) | 893.62 mi (1,438.14 km) |
| Manassas to Owensboro (Kentucky) | 526.90 mi (847.96 km) |
| Manassas to Owings Mills (Maryland) | 59.01 mi (94.96 km) |
| Manassas to Owosso (Michigan) | 456.23 mi (734.22 km) |
