Nassau County Assesor's Office

240 Old Country Rd
Mineola NY 11501

Sponsored Topics

Opening Hours

  • Mon: 9am-5pm
  • Tue: 9am-5pm
  • Wed: 9am-5pm
  • Thu: 9am-5pm
  • Fri: 9am-5pm


  • American Express
  • ATM/Debit
  • Cash
  • Discover
  • MasterCard

See a problem? Let us know!
<p>The Nassau County Assessor is responsible for determining the fair market value for all real property&nbsp;-- residential, commercial and industrial -- within Nassau County annually.&nbsp;The assessment department collects and records information on&nbsp;more than&nbsp;418,000 properties in the county for its assessment roll, with a collective value of&nbsp;more than&nbsp;$309 billion as of 2010.</p> <p>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&nbsp;tax maps, answers inquiries as they relate to real property and examines applications for property tax exemptions.</p> <p>Property owners may also challenge their assessments at the office.</p>