Johnson County property owners are reminded that the second installment of property and mobile home taxes were due on Wednesday, March 1, 2023. March payments need to be delivered to the Treasurer’s Office, paid online, or postmarked by Friday, March 31, 2023, to avoid a 1 ½ percent monthly penalty that will begin on Saturday, April 1, 2023.

In-person March payments must be made at the Johnson County Treasurer’s Office in the Johnson County Administration Building, located at 913 S. Dubuque Street in Iowa City, Monday through Friday from 8 a.m. to 5 p.m.

If paying by mail, the stub portion of the tax statement must be submitted with the payment. Payments must be mailed to the Johnson County Treasurer, PO Box 2420, Iowa City, IA 52244-2420. March payments postmarked by Friday, March 31, 2023, will be considered paid on time and no interest will be charged. The U.S. Postal Service postmark is the only date recognized for date of mailing. The date written on a check or a business metered date cannot be accepted as proof of the mailing date. Residents who would like a receipt must include a self-addressed stamped envelope with their payment.

To make an online payment, visit You can pay with an e-check; debit card; or VISA, MasterCard, Discover or American Express credit card. Those methods of payment, whether online or at the Treasurer’s Office, are subject to a convenience fee.

County Treasurers collect property taxes on behalf of all jurisdictions in the county and then distribute the taxes collected to the other jurisdictions, including the property owner’s city of residence, school district and other taxing bodies in the county.

More information is available at For questions, call the Johnson County Treasurer’s Office at 319-356-6087.