, www.LongIslandSeniorsHousing.com , www.LongIslandGolfProperties.com,   www.LIHomeAuction.com ,  www.LIWaterfrontProperties.com , &  www.PrudentialElliman.com ,  www.prudential.com/realestate .   Setauket Information Setauket-East Setauket is a census-designated place (CDP) in Suffolk County , New York on the North Shore of Long Island . As of the United States 2000 Census , the CDP population was 15,931. The