Mercer County Reassessment

Making use of the latest mass appraisal technology & proprietary software applications, Tyler Technologies has been contracted to employ uniform standards of mass appraisal practices by collecting exterior property characteristics and use this information along with legacy records, location and recent sales data, to support fair and equitable valuation of real property for Mercer County.

Happening Now

Tyler Technologies’ data collection staff continues the job of visiting each of the over 60,500 parcels in the County’s current records, measuring improvements and collecting data regarding the interior of homes and businesses. The data collected will allow our teams to accurately value each and every parcel throughout the county.

As the first pass of data collection is completed, data mailers will be sent to owners of improved residential parcels. Data mailers are not sent out for vacant land or any commercial or industrial parcels. The first set of data mailers is being mailed out on February 28, 2025, to property owners in West Middlesex, Wheatland, Farrell and Shenango. Some areas of those municipalities are not yet complete, including mobile homes and mobile home parks, and data mailers will be sent to those owners at a later date. When you receive a data mailer, we ask that you review the information for accuracy. If the information is correct, you do not need to return the form. If any of the information needs to be corrected, you can write any corrections on the form and mail it back to the address on the form, or scan or send a photo of the form via email to: [email protected]. The corrected form can also be dropped off at the reassessment project office located in the Mercer County Courthouse, 125 S. Diamond Street, Room 18, with office hours Monday through Friday between 8:30 am and 4:00 pm. If you have any questions, you can call 724.662.7549 for assistance.

Value notices will be sent at a later date once all of the data has been collected and property owners have had the opportunity to review the data and make any changes necessary.

For more information, please download our frequently asked questions (FAQ) document and check back here for updates as the project progresses.

Contact Information

Mercer County Contact Information
Cathy S. Herriott, Chief Assessor
125 S. Diamond Street, #4
Mercer, PA 16137
E-mail: [email protected]
Phone Number: 724.662.3800 ext. 2505
Office Hours: 8:30 AM - 4:30PM | Mon-Fri 

Tyler Contact Information
125 S. Diamond Street, #504
Mercer, PA 16137
E-mail: [email protected]
Phone Number: 724.662.7549