Working Together for Fair and Equitable Reassessment

Data Mailer Information

New Castle County Website

Property Search

Data Mailer Information


If you have not already returned your mailer with corrections,
you will need to book an appointment for an informal hearing to have the data changed

  • Data mailers are being sent to every improved residential parcel throughout New Castle County.
  • The purpose of the data mailer is to list characteristic information of the parcel that was observed during a physical inspection.
  • Please review the data mailer for accuracy.
    • If there are mistakes on the mailer, please add the correct information directly on the form and return to Tyler Technologies.
  • Please send all returns to:
    • By regular mail: 57 Reads Way, New Castle County, DE
    • Or return by email: [email protected]

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New Castle County
Property Reassessment

All things change with time. New Castle County’s Assessment system is no exception. New Castle County has contracted with Tyler Technologies to conduct a reassessment project to update property assessments from a base year of 1983, providing an efficient technical process with current, accurate property values.

The purpose of conducting the reassessment is to remedy a Delaware Chancery Court ruling in 2020 that found property taxing systems in each of the state's three counties to be unconstitutional and not in compliance with Delaware law.

Property Owners should be on the lookout for our data collectors. They will be making their way through New Castle County, visiting every property, measuring improvements on the property and collecting data. The data collector may also ask the occupants several questions about the property.

Once the data has been collected, a data mailer will be mailed to the property owner with the information that was collected. Please let us know if there is an error or if something was missed. The most accurate information will ensure the most accurate value for the property.

After all the data is collected and data mailers have been returned and reviewed, Tyler Technologies will begin analyzing the data. 

For more information, please download our frequently asked questions document and check back for updates as the reassessment progresses. Important information will be uploaded to the website, as needed. If you have any additional questions, please contact Tyler Technologies at 302.395.3620.

Have additional questions?

We compiled a list of frequently asked questions to help you better understand how a reassessment works and how it affects you. Click the link below to review the questions and responses.

View FAQ (English)

View FAQ (Spanish)