Maricopa County, Arizona

Arizona Senate District 13

2 candidates are tracked for Arizona Senate District 13 on the November 3, 2026 ballot: Julie Willoughby and Kristie O'Brien. Candidate information follows official Maricopa County election filings; verify with the official election office linked below.

About this race

Julie Willoughby (Republican), Kristie O'Brien (Democratic) are on the November 3 ballot for Arizona Senate District 13. Not on the November ballot: J.D. Mesnard, the sitting member per the roster. Nominees were chosen at the July 28 primary or by petition/nomination for minor parties and independents. The field is the Secretary of State's 2026 General Election (Election 69) certified candidate list, as read September 10, 2026. This seat is elected by district; only the district covering your address appears on your ballot.

What this office does

State legislator. State legislators write and vote on state laws and the state budget, which fund schools, roads, prisons, universities and health programs, and set the rules for local governments and elections. Each member represents one district and serves on committees that shape bills before a floor vote. Terms are two years in most state houses and four in most state senates.

This race. Elected by district: only voters who live in the district see this race on their ballot.

Arizona › Maricopa County › Arizona Senate District 13

Julie Willoughby

Republican

Top priorities

Addressing rising costs for families
Education and parental rights
Timely and affordable healthcare

Per the campaign site.

Biography

Julie Willoughby is the Republican candidate for Arizona Senate District 13 on the November 3, 2026 ballot, per the Secretary of State's 2026 General Election certified candidate list. Willoughby is an ER trauma nurse and small business owner who currently represents Legislative District 13 in the Arizona House, per campaign site.

Campaign site (opens in a new tab)

Kristie O'Brien

Democratic

Top priorities

Frames her candidacy around finding common-sense, practical solutions rather than partisan division

Per the campaign site.

Biography

O'Brien is a lawyer turned mediator who grew up in Chandler, per the campaign site. She previously worked as a Capitol Hill staffer for senators from both parties and as an attorney at the International Criminal Court in The Hague, and holds degrees from Trinity College and Johns Hopkins School of Advanced International Studies, per the campaign site.

Campaign site (opens in a new tab)

Next on your ballotArizona Senate District 14

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Voting info and more

Questions about this race

Who is running for Arizona Senate District 13 in 2026?

When is the Arizona Senate District 13 election in Arizona?

Election Day is Tuesday, November 3, 2026. Registration deadlines, early voting dates and mail ballot rules for Arizona are on the Arizona election hub at theballotbrief.com.

How do I see my exact Maricopa County ballot?

Enter your ZIP code in the lookup at theballotbrief.com for the statewide and congressional races, or a full street address to add the county, city and district contests for that location.

Verify this race

Candidate roster from official Maricopa County and state election office filings, last verified September 25, 2026. Bios and priorities carry their attribution inline.

Cross-check with the official Arizona election office, or see the full Maricopa County sample ballot and your exact ballot by address.

The rest of your Maricopa County ballot

45 tracked races in Maricopa County, Arizona. Landed here from another county's search? Look up your own ballot below.

Also on your ballot

Arizona Senate District 15 Arizona Senate District 16 Arizona Senate District 22 See all 45 Maricopa County races

Candidate profiles

Julie Willoughby, full profile Kristie O'Brien, full profile Official Arizona election office