Whiteside County Treasurer/Collector

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Whiteside County Treasurer/Collector Contact information, map and directions, contact form, opening hours, services, ratings, photos, videos and announcements from Whiteside County Treasurer/Collector, Government Organization, 200 E Knox Street, Morrison, IL.

The late notices have been mailed for the real estate and mobile home taxes.  They were mailed certified.  Please pick u...
10/05/2026

The late notices have been mailed for the real estate and mobile home taxes. They were mailed certified. Please pick up your letter at the post office as it has very important payment information. At this time, we no longer accept personal checks. Payment must be made with certified funds, such as cashier's check, money order or cash. You may also go online to www.whitesideil.us or call 1-309-396-6448 and pay with a credit card. The convenience fee is 2.25% of the amount being paid. By law, delinquent taxes must be published in the local newspaper. The last day to pay to avoid publication is Friday, Oct 9th. We must receive the payment in the office! Please call our office with any questions.

09/21/2026

Important Tax Deadlines: Mobile Home & Real Estate

Stay informed on upcoming tax deadlines for Whiteside County.

* Sept 30: Delinquent Notices mailed

* Oct 2: Last day for personal checks/E-checks

* Oct 9: Last day to pay before publication

* Oct 19-23: Mobile Home/Real estate tax publication

* Oct 30: Last day for credit card payments

* Nov 2: Application for Judgment

* Nov 5: Tax Sale

Please call our office at 815-772-5196 with any questions.

09/18/2026

Power is back on!!

09/18/2026

FYI - The power is out at the Morrison Courthouse.

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09/05/2026

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The 2nd Installment of real estate taxes are due tomorrow Sept 1, 2026!  Payment Options:*Drop Box - Law Enforcement Cen...
08/31/2026

The 2nd Installment of real estate taxes are due tomorrow Sept 1, 2026!
Payment Options:
*Drop Box - Law Enforcement Center
*Mail - Postmarked by the due date is considered timely
*At most banks in Whiteside County - Must have tax bill
*Credit Card or E-Check (Convenience Fee Applied) www.whitesideil.us or by phone 1-309-396-6448 or at office
*In Person at Treasurer's Office - 200 E Knox St (2nd Floor) Hours are M-F 8:30 - 4:30

Please call our office with any questions. 815-772-5196

08/21/2026

The 2nd Installment of real estate taxes are due Tuesday Sept 1, 2026!! Please call our office with any questions.
815-772-5196

06/18/2026

REMINDER
We will be closed Friday, June 19th in observance of
JUNETEENTH

06/11/2026

Hello Whiteside!

The 1st installment of property taxes are due next Wednesday, June 17th! Please see the back of your bill for all payment options available. Please contact our office with any questions. 815-772-5196

05/26/2026

REMINDER: The MOBILE HOME taxes are due next Monday, June 1, 2026. Please call the Treasurer's office with any questions. 815-772-5196

Address

200 E Knox Street
Morrison, IL
61270

Opening Hours

Monday 8:30am - 4:30pm
Tuesday 8:30am - 4:30pm
Wednesday 8:30am - 4:30pm
Thursday 8:30am - 4:30pm
Friday 8:30am - 4:30pm

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