| Lake | County | Latitude | Longitude |
| Ulster Heights Lake | Ulster | 41.775146 | -74.492720 |
| Unnamed Lake | Orange | 41.540456 | -74.272491 |
| Unqua Lake | Nassau | 40.668250 | -73.444068 |
| Unser Lake | Orange | 41.349833 | -74.136570 |
| Upper Ausable Lake | Essex | 44.076679 | -73.870767 |
| Upper Cascade Lake | Essex | 44.223277 | -73.878503 |
| Upper Chateagay Lake | Clinton | 44.737479 | -73.967510 |
| Upper Francis Pnd | Nassau | 40.868848 | -73.566769 |
| Upper Lake Nimham | Putnam | 41.475002 | -73.728262 |
| Upper Pine Lakes | Hamilton | 43.598301 | -74.276969 |
| Upper Reservoir | Orange | 41.411126 | -74.004561 |
| Upper Saint Regis La | Franklin | 44.410220 | -74.278240 |
| Upper Saranac Lake | Franklin | 44.290812 | -74.318786 |
| Upper Sister Lake | Hamilton | 43.884710 | -74.762349 |
| Upper Winganhauppaug | Suffolk | 40.726266 | -73.202615 |
| Upton Lake | Dutchess | 41.846525 | -73.752662 |
| Utowana Lake | Hamilton | 43.836822 | -74.516658 |
| Utsayantha Lake | Schoharie | 42.425207 | -74.617748 |