Emergency Notifications & Announcements


Assessor’s Office


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Welcome to the Town of Thompson Assessor’s Webpage

The Assessor is responsible for the valuation of real property in the Town of Thompson and the Village of Monticello.  The office is also responsible for the administration of various tax exemptions in accordance with New York State Real Property Tax Law, and local laws, along with the maintenance of property inventory records.  Click here for more information about the Job of the Assessor.

Van B. Krzywicki, IAO  Assessor assessor@townofthompson.com 845-794-2500  x324

Office Hours: Mon -Fri  8:30 am – 4:30 pm   Location: Thompson Town Hall, 4052 SR 42, Monticello, NY 12701

Angela Ruggeri, Assessor Clerk   angela@townofthompson.com 845-794-2500  ext 324

Richard McClernon, Data Collector


Key Facts and Figures: Town of Thompson, Sullivan County NY


Assessment Information


Exemption Administration


Tax Grievance Information


Property Analysis Tools


Assessor Forms


  • Link to State Forms by Number
  • Agricultural Assessment Application                                                   RP-305
  • Alternative Veteran’s Exemption Application                                   RP-458a
  • Annual Forestry Commitment
  • Change of Address Form
  • Cold War Veterans Exemption Application                                       RP-458b
  • Commercial, Business, Industrial Tax Exemption Application     RP-485b
  • Complaint on Real Property Assessment                                           RP-524
  • Partial Tax Exemption for Real Property of Senior Citizens and Enhanced STAR  RP-467
  • Register for STAR
  • STAR Optional Income Verification Program                                    RP-425-IVP