John Gioia is the Supervisor, District 1, Contra Costa County, in Contra Costa County, California.

What party is John Gioia?

Supervisor, District 1 is elected on a nonpartisan ballot, so no party is listed for John Gioia.

Where does John Gioia stand politically?

There's no published left–right score for John Gioia. 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 John Gioia? Supervisor, District 1, Contra Costa County

John Gioia is the Supervisor, District 1, Contra Costa County.

In office

Office	Who holds it now
Supervisor, District 1 · Contra Costa County Board of Supervisors	John Gioia source

Contra Costa County Board of Supervisors's website (contact the office there) · everyone on it

Where John Gioia 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.

Quick answers

Who is John Gioia?: John Gioia is the Supervisor, District 1, Contra Costa County, in Contra Costa County, California.
What party is John Gioia?: Supervisor, District 1 is elected on a nonpartisan ballot, so no party is listed for John Gioia.
Where does John Gioia stand politically?: There's no published left–right score for John Gioia. 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 John Gioia?

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Officeholders as of November 6, 2026, from the Secretary of State's California Roster; 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.

Contra Costa County's elected officials

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