Platte County, Missouri

Platte County Clerk

2 candidates are tracked for Platte County Clerk on the November 3, 2026 ballot: Mary Calvillo and Hans Peter. Candidate information follows official Platte County election filings; verify with the official election office linked below.

About this race

August 4 primary result: Mary Calvillo (40.6 percent) won the Republican nomination over Jera Pruitt (31 percent), Russ "Wojo" Wojtkiewicz (28.4 percent) and advances to the November 3 ballot, per plattecountylandmark.com reporting of the official results (re-verify against the certified canvass). A contested Republican ballot on August 4 between the incumbent and two challengers; Hans Peter is unopposed on the Democratic side, per the Platte County Landmark.

What this office does

County clerk. The county clerk keeps the county board's official records and minutes and, depending on the state, issues marriage licenses, business filings and vehicle registrations. In many states the county clerk also runs elections: voter registration, ballots, polling places and the certification of local results.

This race. Every voter in Platte County votes on this seat.

Missouri › Platte County › Platte County Clerk

Mary Calvillo

Republican

Top priorities

Modernizing the clerk's office website and public-records access
Speeding up the senior tax credit process
Extending office hours

Per the Platte County Landmark.

Biography

Calvillo has more than four decades of experience in office management, executive assistance and customer service and earned a degree in personnel management and international marketing from Missouri State University, per the campaign site. She has lived in Platte County for 28 years with her husband, Roberto, per the campaign site.

Campaign site (opens in a new tab)

Hans Peter

Democratic

Top priorities

Wants an alternative salary-setting process so elected officials cannot set their own pay
Wants to digitize the clerk's office records using his logistics background
Pledges to keep the office strictly non-partisan

Per The Platte County Landmark Newspaper.

Biography

Hans Peter is a Benedictine College graduate who has worked in supply chain and logistics roles, currently as a global forwarding agent for C.H. Robinson, per The Platte County Landmark Newspaper. He is the Democratic candidate for Platte County Clerk. No campaign website was found as of September 6, 2026.

Next on your ballotPlatte County Recorder of Deeds

See your full ballot

Voting info and more

Questions about this race

Who is running for Platte County Clerk in 2026?

When is the Platte County Clerk election in Missouri?

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

How do I see my exact Platte 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 Platte County and state election office filings, last verified October 2, 2026. Bios and priorities carry their attribution inline.

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

The rest of your Platte County ballot

11 tracked races in Platte County, Missouri. Landed here from another county's search? Look up your own ballot below.

Also on your ballot

Platte County Auditor Platte County Collector Platte County Treasurer (unexpired two-year term)See all 11 Platte County races

Candidate profiles

Mary Calvillo, full profile Hans Peter, full profile Official Missouri election office