Delaware County Reassessment Project – Update 2/19/19

Update: 2/19/19 from Delaware County

Delaware County has been made aware of residents reporting a suspicious person to law enforcement and/or calling law enforcement to verify if the person is collecting data for the County’s Tax Reassessment Project.

As part of the County’s Tax Reassessment Project, staff from Tyler Technologies are conducting data collection throughout the County. The data collectors will always be wearing a bright yellow vest bearing the Tyler name on the back and displaying a County issued identification. They have been trained to knock, identify themselves if someone is home, and inform the occupant of the reason for their visit. They will be measuring the exterior of homes and will never ask to enter a home. Currently, a team of five members of Tyler Technologies is conducting data collection throughout the County. Their names, photos and a description of their vehicles can be found on the County’s website.

More information can be found here:

Here are links to the social media:


Update: 12/17/18 from Delaware County:

Please be advised that Tyler Technologies has been contracted by Delaware county to provide valuation services for the 2021 countywide reassessment project. During this phase of the project, our staff will be working within your municipality to collect current property data and confirm or verify existing county assessment property records. This occurs by visiting properties, measuring improvements, observing and noting all exterior building characteristics.

These efforts will be conducted by Tyler employees, called Data Collectors, who can be identified by their day-glo work vests which bear the “TYLER” name on the back and by their Delaware county issued photo ID badge. At each property, data collectors will knock on the door before proceeding with data collection. If an adult is home, data collectors will ask a series of questions relevant to the property characteristics – such as room count, basement area, type of heating/cooling, date of last remodel, etc. They will never ask to be invited into the home.

Effective January 2, 2019 Data Collectors will begin working in your municipality.

Should you or the residents within your area have any questions, please call our informational hotline, telephone # (610) 891-5695. Tyler staff will be happy to assist.

Additional information can also be found by visiting the reassessment project website:


Update 10/10/18

County Reassessment July 2018 Press Release

Data mailers will be mailed to the owners of residential properties as part of Delaware County’s Tax Reassessment Project beginning on Oct. 4.

In March 2017 Delaware County was ordered by the Court to conduct a countywide property tax reassessment, effective for the 2021 tax year. Delaware County Council contracted with Tyler Technologies Inc. in 2017 to provide real property appraisal services for the County’s 2020 general reassessment. The project, which is being implemented through the County Treasurer’s Office is utilizing Tyler’s appraisal and street imaging services.

The data mailer provides information that was recorded from a property by Tyler Technologies Inc.  Property owners will be asked to review the information for accuracy and to report any errors to Tyler. Property owners should review the data, comparing it to their property. If the information is correct, there is no need to do anything further.  If the information is incorrect, owners should write any needed changes on the mailer and return it signed, dated, and with contact information within 14 days.

A glossary of terms can be found on the back of the data mailer to help property owners understand the information on the mailer.  Distribution of data mailers will begin on October 4, 2018 in Upper Darby Township and continue through June 2019 to residential property owners throughout the county.

Tyler staff will be in Delaware County throughout the reassessment process, concluding in 2020. The reassessment project includes data gathering, verification of data, establishment of assessed values and an opportunity to appeal.  The project will also allow verification and correction of address discrepancies.

Delaware County has set up a website dedicated to educating residents and answering questions regarding Delaware County’s Tax Reassessment Project. The website includes a video presentation on the Tax Reassessment process. A sample data mailer, the glossary of terms and updated project information can also be found on the website:

A Reassessment Hotline has also been set up for residents to call with any questions or concerns: 610-891-5695.