| Troy to Oskaloosa (Iowa) | 495.79 mi (797.89 km) |
| Troy to Oswego (Illinois) | 273.10 mi (439.52 km) |
| Troy to Oswego (New York) | 340.94 mi (548.69 km) |
| Troy to Otsego (Minnesota) | 552.77 mi (889.60 km) |
| Troy to Ottawa (Illinois) | 303.79 mi (488.91 km) |
| Troy to Ottawa (Kansas) | 691.94 mi (1,113.57 km) |
| Troy to Ottumwa (Iowa) | 489.39 mi (787.59 km) |
| Troy to Overland (Missouri) | 463.92 mi (746.61 km) |
| Troy to Overland Park (Kansas) | 655.24 mi (1,054.51 km) |
| Troy to Overlea (Maryland) | 410.88 mi (661.24 km) |
| Troy to Oviedo (Florida) | 968.22 mi (1,558.21 km) |
| Troy to Owasso (Oklahoma) | 803.25 mi (1,292.70 km) |
| Troy to Owatonna (Minnesota) | 517.10 mi (832.20 km) |
| Troy to Owensboro (Kentucky) | 393.68 mi (633.56 km) |
| Troy to Owings Mills (Maryland) | 397.04 mi (638.98 km) |
