New York Property Tax Assessors

Onondaga County, New York Tax Assessors' Office

Onondaga County Assessors Phone Number
Onondaga County Office of Real Property Tax Services
421 Montgomery Street
John H. Mulroy Civic Center - 15th Floor
Syracuse, New York 13202
Onondaga County Assessors Fax Number 315-435-2421 (Fax)

Where is the Onondaga County Tax Assessor's Office?

The Onondaga County Tax Assessor & Real Property Tax Services & Tax Foreclosure Auctions Office is located in the John H. Mulroy Civic Center - 15th Floor building in Syracuse, New York.

While many counties have county-wide tax assessors, Onondaga County has one cities and towns with their own local tax assessors. If your property is located within any of these localities, see that page for your tax assessor's contact information.

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

The Onondaga 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 Onondaga 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 Onondaga 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 Onondaga County Assessor's Office at (315) 435 2426 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 Onondaga County Facts:

The median home value in Onondaga County is between $123,143.00 and $125,657.00. Property tax rates are based on property values.

How can I contact Onondaga County?

You can try contacting the Onondaga 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 Onondaga County is located in the John H Mulroy Civic Center in Syracuse, which is where the Onondaga County Assessors' Office is also located. You can direct your general inquiries to Onondaga County with the contact info listed below.

Onondaga County Phone Number


Onondaga County Fax Number


Onondaga County John H Mulroy Civic Center Address

John H Mulroy Civic Center
421 Montgomery St
Syracuse, NY 13202-2923