Barbara and Lee Mitchell say the ticket explained they were entitled to a hearing on the matter or could plead guilty and simply pay the fine, The Glencoe News reports.
If they chose to forgo a hearing, the instructions advised them "do not send cash."
Deputy Chief Mike Volling of the Glencoe Police Department said he's at a loss to explain the ticket.
"Obviously somebody messed up when it was entered into the computer." He said.
The Mitchells say the dollar amount of the ticket, $9,501,071, coincides with the license plate of the car.