St. Clair County Treasurer

Building Construction Information

The St. Clair County Administration and Courts Building is preparing to undergo extensive renovations that will affect parking, traffic, and building access. To aid those who are planning on visiting the building, we have set up an informational page that will provide the most up-to-date notices.

Know Before You Go

Real Estate and Mobile Home Tax Bills

The Real Estate and Mobile Home Inquiry portal is experiencing an outage. We have made our vendor aware and they are working to address the issue. Thank you in advance for your patience and understanding.

Pay Real Estate & Mobile Home Taxes

Real Estate & Mobile Home Inquiry

For Real Estate Taxes: 1st Installment was due 7/2/25, 2nd Installment was due 9/2/25.

To avoid publication and certified notice fees, all payments must be received in our office no later than 4:30 pm Friday, September 19, 2025. Postmark cannot be honored for this due date.

LAST DAY TO PAY Real Estate Tax Year 2024 and Mobile Home Tax Year 2025 tax bills is Friday, October 31, 2025. Payments MUST be RECEIVED in our office no later than 4:30 pm.

If you need a copy of any current or prior year tax bill, you may view and print a copy using the Parcel Inquiry button above.

General Information

The Treasurer’s Office is responsible to safeguard, maintain and invest more than $185 million in County funds.

Our commitment is to provide excellence in public services. The St. Clair County Treasurer’s office exists simply as a resource which enables the public to benefit from the tax dollars they are required to pay.

Our goals include:

Maintaining professional courtesy and integrity
Having a proactive attitude in raising technical or business related issues
Insuring that all County money is secure, liquid as needed and invested at a fair market or higher rate
Holding all tax money prior to distribution at fair market or higher rates
Providing more information about property tax exemptions, programs and procedures.

Department Info

Andrew Lopinot

Treasurer

Treasurer’s Office

#10 Public Square
Belleville, IL 62220

(618) 825-2707
(618) 825-2274 - Fax
treasurer@co.st-clair.il.us

Business Hours:
M-F 8:30am - 4:30pm

St. Clair County Treasurer

Building Construction Information

Real Estate and Mobile Home Tax Bills

General Information

Department Tools

Additional Department Resources

Real Estate / Mobile Home Tax Resources

Department Info

Andrew Lopinot

Treasurer’s Office

Meetings & Events