The first half of the year’s property taxes are due in by March 31st. Payments postmarked on or before March 31st will be accepted without penalty. Any payment marked April 1st or later will be subject to penalty. The last day to pay in person at the Courthouse is Thursday March 31st. Payments may be mailed to the Marion County Treasurer, PO Box 515 in Knoxville or online at www.iowatreasurers.org.