[Delaware Assessors]
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New Castle County, Delaware - Assessor's Office

The New Castle County Assessor is responsible for appraising real estate and assessing a property tax on properties located in New Castle County, Delaware. You can contact the New Castle County Assessor for:

  • Paying your property tax
  • Information on your property's tax assessment
  • Your property tax bill
  • Reporting upgrades or improvements
  • Checking the New Castle County property tax due date
  • Appealing your property tax appraisal

800 North French StreetThe New Castle County Assessor's Office is located in Wilmington, Delaware. Wilmington is the county seat of New Castle County, where most local government offices are located.

New Castle County Assessor Contact Information

Additional New Castle County Information

New Castle County Assessor's Office Services

There are three major roles involved in administering property taxes - Tax Assessor, Property Appraiser, and Tax Collector. Note that in some counties, one or more of these roles may be held by the same individual or office. For example, the New Castle County Tax Assessor may also serve as the New Castle County Tax Appraiser.

  1. The New Castle County Tax Assessor is responsible for setting property tax rates and collecting owed property tax on real estate located in New Castle County.
  2. The New Castle County Property Appraiser is responsible for determining the taxable value of each piece of real estate, which the Tax Assessor will use to determine the owed property tax.
  3. The New Castle County Tax Collector is responsible for collecting property tax from property owners. They issue yearly tax bills to all property owners in New Castle County, and work with the sheriff's office to foreclose on properties with delinquent taxes.

When contacting New Castle County about your property taxes, make sure that you are contacting the correct office. You can call the New Castle County Tax Assessor's Office for assistance at 302-395-5520. Remember to have your property's Tax ID Number or Parcel Number available when you call!

Please call the assessor's office in Wilmington before you send documents or if you need to schedule a meeting. If you have general questions, you can call the Louis L. Redding City/new Castle County Building at 302-395-8383.


Learn More

Find the tax assessor for a different Delaware county

Find property records for New Castle County

The median property tax in New Castle County, Delaware is $1,385.00


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