On April 6, 2021 voters in O’Fallon will choose a new mayor.
There are five candidates running for a four-year term. Candidates are listed in order they will appear on the ballot.
- Paul C. Carlson
- William “Bill” Hennessy
- Debbie Cook
- Mike Pheney
- Arnie C. AC Dienoff
The incumbent, Bill Hennessy, has served as the mayor of O’Fallon since 2009. Cook is a current member of the city council, and Mike Pheney is a past member of the council.