Code of Ordinances
Of Union County, Illinois.
36-1-5 Late Payment
Any notice, payment, remittance or other filing required to be made to the County pursuant to any tax ordinance shall be considered late unless it is:
(A) physically received by the County on or before the due date, or
(B) received in an envelope or other container displaying a valid, readable U.S. postmark dated on or before the due date, properly addressed to the County, with adequate postage prepaid.
Retrieved from: www.unioncountyil.gov