| Thornton to Oswego (Illinois) | 3,848.12 mi (6,192.95 km) |
| Thornton to Oswego (New York) | 3,320.20 mi (5,343.34 km) |
| Thornton to Otsego (Minnesota) | 3,863.77 mi (6,218.13 km) |
| Thornton to Ottawa (Illinois) | 3,882.03 mi (6,247.53 km) |
| Thornton to Ottawa (Kansas) | 4,254.96 mi (6,847.69 km) |
| Thornton to Ottumwa (Iowa) | 4,029.72 mi (6,485.21 km) |
| Thornton to Overland (Missouri) | 4,070.38 mi (6,550.65 km) |
| Thornton to Overland Park (Kansas) | 4,219.37 mi (6,790.41 km) |
| Thornton to Overlea (Maryland) | 3,507.45 mi (5,644.70 km) |
| Thornton to Oviedo (Florida) | 4,223.46 mi (6,797.00 km) |
| Thornton to Owasso (Oklahoma) | 4,395.05 mi (7,073.14 km) |
| Thornton to Owatonna (Minnesota) | 3,907.33 mi (6,288.24 km) |
| Thornton to Owensboro (Kentucky) | 3,994.92 mi (6,429.20 km) |
| Thornton to Owings Mills (Maryland) | 3,515.99 mi (5,658.44 km) |
| Thornton to Owosso (Michigan) | 3,631.55 mi (5,844.42 km) |
