This website allows you to access the Assessment Roll for properties within the Town of Islip. While the Town of Islip does strive to provide users with only the most current and accurate information available, this site is not meant to serve as a provider of official information, and as such does not speak for the Town of Islip, the Assessor's Office, or for any other Town Department.

The Town of Islip makes no guarantees concerning the accuracy and the content of the information provided, as these records could include errors, defects, or misinformation. The Town of Islip is not responsible for detriments suffered as a result of reliance upon any errors, defects or misinformation, including but not limited to loss of profits and consequential damages.

You should not assume that this web site is entirely error free or that it will necessarily be suitable for the particular purpose that you intend when using it.

All information presented on this site is subject to verification by the departments or agencies responsible for producing, entering, and updating that data for the Town of Islip.

Nothing presented on this site in any way supersedes the Islip Town Code or any other laws, rules, or regulations. For definitive regulations, you must consult official copies of maps, code books, and laws.

The parcel dimensions of a property provided on this site are approximations. Please consult a land survey for precise dimensions.

The Assessment inventory does not always reflect a property's allowed use. The mere inclusion of a use, addition or alteration on the inventory does not guarantee legal compliance with the Islip Town Code. A property's authorized use is reflected on its Certificate of Occupancy. Please consult the Town of Islip Building Division for verification of the Certificate of Occupancy.

Although this site is a public service provided free of charge, all the data, software, and hardware used to bring this information to you is the property of the Town of Islip. Any unauthorized attempt to upload or change information on this web site is strictly prohibited. Any unauthorized attempts at access to the server shall be prosecuted to the fullest extent of the law.

Any use and/or dissemination of the information contained herein is performed at your own risk.

If you have any questions concerning the information provided on this site, or if you need verification of any item provided, please address all inquiries to the Town of Islip Assessor's Office during business hours at (631) 224-5585 or by mail at 40 Nassau Avenue, Islip, New York 11751. E-mail inquiries can be addressed to This email address is being protected from spambots. You need JavaScript enabled to view it..

The Town of Islip may occasionally update this Terms and Conditions statement to reflect Town and constituent feedback. The Town encourages you to periodically review this statement to stay informed of your risks and liabilities concerning the information presented herein.