Thank you for visiting the Tompkins County Department of Assessment. This office was consolidated in 1970 to provide the highest possible service at the lowest possible cost to the residents of Tompkins County.  Our office is dedicated to ensuring that all properties are assessed at a uniform percentage of market value. This site includes real property inventory , tax maps , real property tax exemptions and tax rate spreadsheets. We are committed to keeping you aware of changes to the New York State Real Property Tax Law and how those changes affect real property taxation in Tompkins County. As always, our office is here to assist you in any way we can.