What party is Dennis Gannon?

Dennis Gannon was elected as a Republican; the office is elected on a partisan ballot.

Where does Dennis Gannon stand politically?

There's no published left–right score for Dennis Gannon. Most local officials have none: academic scores come from votes in Congress or a state legislature, or from campaign donors, and we don't guess.

Who is Dennis Gannon? County Executive, Jefferson County

Dennis Gannon is the County Executive, elected as a Republican.

In office

Office	Who holds it now
County Executive · Jefferson County Council	Dennis Gannon Republican source

Jefferson County Council (contact the office there) · everyone on it

Where Dennis Gannon stands

No published left–right score. Most local officials don't have one: the academic scores come from votes in Congress or a state legislature, or from who donates to a campaign, and we don't guess. They were elected on a partisan ballot as a Republican.

Quick answers

Who is Dennis Gannon?: Dennis Gannon is the County Executive, in Jefferson County, Missouri. Elected as a Republican.
What party is Dennis Gannon?: Dennis Gannon was elected as a Republican; the office is elected on a partisan ballot.
Where does Dennis Gannon stand politically?: There's no published left–right score for Dennis Gannon. Most local officials have none: academic scores come from votes in Congress or a state legislature, or from campaign donors, and we don't guess.

Are you Dennis Gannon?

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Officeholders as of November 6, 2026, from the Missouri Secretary of State's Official Manual (Blue Book) 2025–2026; each name links to its source. Officials change between elections (appointments, resignations), and the body's own website is the authority. Party is shown only for offices elected on a partisan ballot.

Jefferson County's elected officials

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