 poestenkill is a hamlet (and census-designated place) in rensselaer county, new york, usa. the population was 1,061 at the 2010 census. the name is from poesten kill, a stream in the area. poestenkill is in the south part of the town of poestenkill. ==geography== poestenkill is located at  (42.695815, -73.563912). the poesten kill flows past the community. according to the united states census bureau, the cdp has a total area of 5.9 square miles (15.2&nbsp;kmÂ²), of which, 5.8 square miles (15.1&nbsp;kmÂ²) of it is land and 0.04 square miles (0.1&nbsp;kmÂ²) of it (0.68%) is water. [[file:p
Census-designated_places_in_New_York Census-designated_places_in_Rensselaer_County,_New_York Hamlets_in_New_York Hamlets_in_Rensselaer_County,_New_York