Estimated using sales prices and appraisal data. Metropolitan Division refers to a county or group of counties within a Metropolitan Statistical Area that has a population core of at least 2.5 million.
Release: House Price Index
US. Federal Housing Finance Agency, All-Transactions House Price Index for Nassau County-Suffolk County, NY (MSAD) [ATNHPIUS35004Q], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/ATNHPIUS35004Q/, July 27, 2015.