| Watertown Town to Olympia (Washington) | 2,513.49 mi (4,045.07 km) |
| Watertown Town to Olympia Heights (Florida) | 1,262.17 mi (2,031.27 km) |
| Watertown Town to Omaha (Nebraska) | 1,278.65 mi (2,057.79 km) |
| Watertown Town to On Top of the World Designated Place (Florida) | 1,106.00 mi (1,779.93 km) |
| Watertown Town to Onalaska (Wisconsin) | 1,012.95 mi (1,630.18 km) |
| Watertown Town to Oneida (New York) | 232.79 mi (374.64 km) |
| Watertown Town to Oneonta (New York) | 198.47 mi (319.40 km) |
| Watertown Town to Ontario (California) | 2,552.71 mi (4,108.19 km) |
| Watertown Town to Ontario (Oregon) | 2,279.73 mi (3,668.86 km) |
| Watertown Town to Opa-locka (Florida) | 1,248.97 mi (2,010.02 km) |
| Watertown Town to Opelika (Alabama) | 1,024.89 mi (1,649.40 km) |
| Watertown Town to Opelousas (Louisiana) | 1,414.77 mi (2,276.85 km) |
| Watertown Town to Orange (California) | 2,571.13 mi (4,137.84 km) |
| Watertown Town to Orange (Texas) | 1,508.84 mi (2,428.25 km) |
| Watertown Town to Orange City (Florida) | 1,086.22 mi (1,748.10 km) |
