City of O'Fallon issued the following announcement on Aug. 6.
O’Fallon City Clerk, Jerry Mouser, announced that nominating petitions will be available in his office during normal business hours Monday – Friday, 8:00 a.m. – 5:00 p.m. beginning September 18, 2018 for those interested in running for the office of Alderman in the April 2, 2019 Consolidated Election.
Original source can be found here.