The median sales price for homes in Islandia NY for Jan 12 to Mar 12 was $167,040 based on 1 home sales. Compared to the same period one year ago, the median home sales price increased 0%, or $167,040, and the number of home sales increased 0%. There are currently 23 resale and new homes in Islandia on Trulia, including 29 homes in the pre-foreclosure, auction, or bank-owned stages of the foreclosure process. The average listing price for homes for sale in Islandia NY was $250,984 for the week ending May 09, which represents an increase of 1.3%, or $3,308, compared to the prior week.