Heather Wilcoxen
Treasurer

Appointed 2025

Democrat

Phone:  (309) 543-3359

Software:  Devnet

Population:  13,898

Zone:  II

Welcome to Mason County, Illinois. 

Office Hours:

• Property Taxes...........Monday - Friday 8:00 - 4:00.

Contact Information:

• Property Tax..............(309) 543-3359
• Fax.............................(309) 543-2085
• Email.......................... treasurer@masoncountyil.gov
• County Website...........www.masoncountyil.org

Our Location:

Mason County Treasurer’s Office
125 N. Plum
Havana, IL 62644-1188