| Watertown Town to Oskaloosa (Iowa) | 1,104.53 mi (1,777.57 km) |
| Watertown Town to Oswego (Illinois) | 880.50 mi (1,417.03 km) |
| Watertown Town to Oswego (New York) | 279.49 mi (449.80 km) |
| Watertown Town to Otsego (Minnesota) | 1,132.76 mi (1,823.01 km) |
| Watertown Town to Ottawa (Illinois) | 909.21 mi (1,463.23 km) |
| Watertown Town to Ottawa (Kansas) | 1,287.68 mi (2,072.32 km) |
| Watertown Town to Ottumwa (Iowa) | 1,096.97 mi (1,765.40 km) |
| Watertown Town to Overland (Missouri) | 1,036.79 mi (1,668.56 km) |
| Watertown Town to Overland Park (Kansas) | 1,251.84 mi (2,014.64 km) |
| Watertown Town to Overlea (Maryland) | 347.71 mi (559.59 km) |
| Watertown Town to Oviedo (Florida) | 1,100.18 mi (1,770.56 km) |
| Watertown Town to Owasso (Oklahoma) | 1,377.30 mi (2,216.55 km) |
| Watertown Town to Owatonna (Minnesota) | 1,113.20 mi (1,791.53 km) |
| Watertown Town to Owensboro (Kentucky) | 899.40 mi (1,447.44 km) |
| Watertown Town to Owings Mills (Maryland) | 357.31 mi (575.04 km) |
