, www.LongIslandSeniorsHousing.com , www.LongIslandGolfProperties.com,   www.LIHomeAuction.com ,  www.LIWaterfrontProperties.com , &  www.PrudentialElliman.com ,  www.prudential.com/realestate .   Southampton Information The Town of Southampton is located in southeastern Suffolk County , New York , U.S. , partly on the South Fork of Long Island . As of the United States 2000 Census , the town