Assessment Office

***Effective Immediately,

The Knox County Chief County Assessment Office mailed exemption renewal applications in February. The deadline for renewing exemptions is September 30, 2020 so there is plenty of time. Due to increased health concerns, we ask that everyone wait to file the application for six to eight weeks. We are concerned for the welfare of our seniors and the general public as well as our staff. This is a fluid situation and changes may occur. Exemption forms are available for download on this page and can be returned either by mail or emailed to

For properties in the City of Galesburg please check the Township’s website as this information is subject to change.

Most questions may be handled by phone. We are asking that you Call 345-3845 for questions about county property and 342-1106 for city property rather than come to the office.

County Supervisor of Assessment: Chris Gray
Phone #: (309) 345-3845
Fax Number: (309) 343-0063
Office Hours:  Monday-Friday 8:30AM-4:30PM

Knox County Annex-Suite 1
121 South Prairie Street
Galesburg, IL  61401

Freedom of Information Officer:  Scott G. Erickson, County Clerk

Duties of Office:
The County Assessment Office provides a variety of services to the public including:

  • Determine accurate market value estimate of property and assure that similar properties have similar assessments.
  • Oversee the township assessors and review their work in valuing real estate.
  • Maintain tax mapping and property assessment records.
  • Monitor and assist property owners with eligible exemptions.

How to get information:
Information regarding the County Assessment office may be obtained by phone or in person.  To reach the office by phone, please call 309-345-3845.  Requests by mail should be sent to 200 South Cherry Street, Galesburg, IL  61401.

Employees:  Full Time 3
Annual Budget Available HERE