The Piatt County Geographical Information System (GIS) offers enhanced search capabilities including lookup by common post office address, PIN, and street intersection.
Click here to go to the Piatt
County GIS site.
Advanced features of the Piatt County GIS are only avaiable by subscription. The annual fee for these additional features is $30.00. To subscribe, please fill out the Interactive Map Subscription Agreement form and follow the instructions at the bottom. Following approval of your contract, you will be provided with access information.
The Office of the Supervisor of Assessments was created by state law to provide statistical assessment performance data to the Illinois Department of Revenue. It is the responsibility of the county's township assessors to assess the properties in their jurisdictions. Sales information is compiled from the transfer declarations recorded in the County Clerk's office. Property record cards are available for each property in the County. Aerial maps are maintained in the office. There are approximately 11,306 parcels in Piatt County at this time. The office administers the following exemptions:
Click on a highlighted exemption for a printable form. Pdf Reader required PLEASE NOTE: All forms, including "Name/Address Change", must be mailed or delivered to our office in person. Faxes will not be accepted.
General Homestead Exemption-$6,000 exemption available for residential property that is occupied by the owners as their principal residence.
Homestead Improvement Exemption-For those that qualify exemption up to $75,000 assessed value of the improvement. Can continue for up to 4 years.
Senior Citizen Homestead Exemption-$5,000 exemption for qualified senior citizens 65 years of age & over. Home is owned and occupied by a senior.
Disabled Veterans Exemption-May exempt up to an assessed value of $70,000. The Illinois Department of Veteran's Affairs determines eligibility for this exemption.
Returning Veterans Exemption-A one-time exemption to qualifying veterans that return from active duty in an armed conflict. Must file an application upon return home.
Disabled Persons Homestead Exemption-$2,000 exemption to those that qualify. Class 2 disabilities ID card obtained from the DMV or proof of disability benefits to qualify.
Additional forms and documents
Name/Address Change.Note: If submitting by mail, form must be notarized or a copy of your driver's license must be enclosed.
USDA Historic Aerial Photography: Information on the United States Department of Agriculture's Farm Service Agency aerial photography program.
Duties of the Supervisor of Assessment:
Holds annual meeting with Township "Assessors
Serves as chairperson of the Farmland Committee
Clerk of Board of Review
Equalize assessments by township
Publish assessment changes for each township
Mail notice of Assessment Changes for each township
Files assessment exemptions when property owner meets qualifications
Maintains an up-to-date property record card system, which lists property index number (pin), legal description, and owner's name, class of property and assessment information.
Supervisor of Assessments
Piatt County Courthouse
101 W. Washington
Monticello, IL 61856
Ph(217)762-4266
Email: