New York Property Tax Assessors

Nassau County, New York Tax Assessors' Office

Nassau County Assessors Phone Number
Nassau County Department of Assessment
240 Old Country Road
Mineola, New York 11501

Where is the Nassau County Tax Assessor's Office?

The Nassau County Tax Assessor Office is located at 240 Old Country Road in Mineola, New York.

What can the Nassau County Assessor's Office do for me?

The Nassau County Tax Assessor's Office oversees the appraisal and assessment of properties as well as the billing and collection of property taxes for all taxable real estate located in Nassau County.

Contact the assessor's office if you need help with paying your property taxes, applying for a homestead exemption or other tax exemption, reporting upgrades to your home, appealing your property tax assessment, or verifying your property records.

Submitting a Nassau County property tax appeal

If you believe that your house has been unfairly overappraised (i.e. appraised at a value higher than the true market value of the property), you can attempt to get your home re-appraised at a lower value by contacting the Assessor's Office to submit a property tax appeal.

You will have to submit a form describing your property and sufficient proof that it is overassessed, including valuations of similar homes nearby as evidence. If your appeal is accepted, your home assessment (and property taxes) will be lowered as a result.

If you would like to appeal your property, call the Nassau County Assessor's Office at (516) 571 1500 and ask for a property tax appeal form. Keep in mind that property tax appeals are generally only accepted in a 1-3 month window each year.

For more information and example appeals, see how to appeal your property taxes.

Useful Nassau County Facts:

The median home value in Nassau County is between $486,431.00 and $489,369.00. Property tax rates are based on property values.

How can I contact Nassau County?

You can try contacting the Nassau County local government directly with any issues the Assessor's Office can't solve. In many counties, certain property records such as deeds are kept in the county courthouse or county archives instead of at the tax assessors' office.

The county seat for Nassau County is located in the County Courthouse in Mineola, which is located at 1 West St. You can direct your general inquiries to Nassau County with the contact info listed below.

Nassau County Phone Number


Nassau County Fax Number


Nassau County County Courthouse Address

County Courthouse
1 West St
Mineola, NY 11501-4813

Useful Nassau County Links:

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