​Mapping and Platting is responsible for maintaining names and address changes in the St. Clair County database. If a mailing address is not correct on a notice or a Property Tax Bill, contact this office to have it corrected. A parcel number of the property or the property address is requireed. It is the taxpayer's responsibility to notify this office of any change of address or error on the bills and notices.

E-mail at: mapping@co.st-clair.il.us
Telephone:  618-277-6600 ext 2524
Mail: St. Clair County
10 Public Square
Belleville, IL 62220
ATTN: Mapping and Platting