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Nassau County Assesor's Office
240 Old Country Rd, Mineola, NY 11501

The Nassau County Assessor is responsible for determining the fair market value for all real property --More residential, commercial and industrial -- within Nassau County annually. The assessment department collects and records information on more than 418,000 properties in the county for its assessment roll, with a collective value of more than $309 billion as of 2010.

The second-largest assessing entity in New York State after New York City, the Nassau County Assessor's Office validates building permits, maintains property records and tax maps, answers inquiries as they relate to real property and examines applications for property tax exemptions.

Property owners may also challenge their assessments at the office.