2018 Jefferson County, Missouri Executive election
November 6, 2018
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The 2018 Jefferson County, Missouri Executive election took place on November 6, 2018. Incumbent County Executive Ken Waller declined to run for re-election to a third term, instead opting to run for County Clerk.[1] Businessman Dennis Gannon, the former President of the County Port Authority, won the Republican primary over sheriff's deputy Gary Stout, and faced former State Representative Jeff Roorda, the Democratic nominee, in the general election. Gannon defeated Roorda by a wide margin, winning 58 percent of the vote.
Democratic primary
Candidates
- Jeff Roorda, former State Representative[2]
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Democratic | Jeff Roorda | 19,572 | 100.00% | |
| Total votes | 19,572 | 100.00% | ||
Republican primary
Candidates
- Dennis Gannon, businessman, former President of the Jefferson County Port Authority[4]
- Gary Stout, county sheriff's deputy, businessman, 2014 Democratic candidate for County Executive[4]
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Dennis Gannon | 16,940 | 65.61% | |
| Republican | Gary Stout | 8,879 | 34.39% | |
| Total votes | 25,819 | 100.00% | ||
General election
Polling
| Poll source | Date(s) administered |
Sample size[a] |
Margin of error |
Dennis Gannon (R) |
Jeff Roorda (D) |
Undecided |
|---|---|---|---|---|---|---|
| Voice Broadcast Corp[5][A] | October 2–4, 2018 | 581 (LV) | ± 3.1% | 35% | 40% | 25% |
Results
| Party | Candidate | Votes | % | |
|---|---|---|---|---|
| Republican | Dennis Gannon | 50,713 | 58.34% | |
| Democratic | Jeff Roorda | 36,220 | 41.66% | |
| Total votes | 86,933 | 100.00% | ||
| Republican hold | ||||
Notes
- ^ Key:
A – all adults
RV – registered voters
LV – likely voters
V – unclear
- Partisan clients
- ^ Poll sponsored by Roorda's campaign
References
- ^ Thorsen, Leah (July 21, 2018). "After months of tumult in Jefferson County, voters will choose new leader". St. Louis Post-Dispatch. St. Louis, Missouri. Retrieved July 21, 2025.
- ^ Herndon Dunn, Rachael (February 8, 2018). "Roorda ups ante in JeffCo executive race on heels of Revis win". The Missouri Times. Retrieved July 21, 2025.
- ^ a b "Election Summary Report - PRIMARY ELECTION - AUGUST 7, 2018 - JEFFERSON COUNTY, MISSOURI - August 7, 2018 Primary". Jefferson County Clerk. August 13, 2018. Retrieved July 17, 2025.
- ^ a b "JEFFERSON COUNTY EXECUTIVE: Two Republicans seek bid to become county's next leader". Leader Publications. Festus, Missouri. July 26, 2018. Retrieved July 21, 2025.
- ^ "MOScout Daily Update: New Ads - Roorda Polling Memo - McDowell Fudged Resume? and more...". The Missouri Scout. October 8, 2018. Retrieved November 16, 2025.
- ^ "Election Summary Report - GENERAL ELECTION - NOVEMBER 6, 2018 - JEFFERSON COUNTY, MISSOURI - November 6, 2018 General - Official Election Results". Jefferson County Clerk. 2018. Retrieved July 17, 2025.