The Ballot Brief
Arapahoe County, Colorado

Arapahoe County Treasurer

One candidate is tracked for Arapahoe County Treasurer on the November 3, 2026 ballot: Michael Westerberg. Candidate information follows official Arapahoe County election filings; verify with the official election office linked below.

About this race

Democratic incumbent Michael Westerberg was unopposed in his June 30, 2026 primary (78,038 votes, 100%); no Republican candidate filed, per the certified summary report. He is expected to appear unopposed on the November 3, 2026 ballot; the county's certified November list was not yet posted as of Sept 8, 2026, so a late unaffiliated or minor-party petition candidate could not be ruled out.

What this office does

County treasurer. The county treasurer collects property taxes and other revenue, holds the county's funds, and invests them under state rules. The treasurer distributes tax collections to the county, cities, school districts and special districts that levy them. The office is a custodian of public money, not the body that sets the tax rate.

This race. Every voter in Arapahoe County votes on this seat. The sitting officeholder, Michael Westerberg, is on the ballot. One name is on the ballot for this seat.

Colorado › Arapahoe County › Arapahoe County Treasurer

Michael Westerberg

Democratic Incumbent

Top priorities
  • Investing county funds wisely and responsibly
  • Improving quality of life for residents and county staff
  • Developing new financial tools for the county's future

Per the campaign site.

Biography

Westerberg is the sitting Arapahoe County Treasurer, per the county's official treasurer page. He was first elected four years ago and is running for re-election, per his campaign site. He was unopposed in the Democratic primary, per the certified summary report.

Campaign site (opens in a new tab)
Next on your ballotArapahoe County Assessor

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Voting info and more

Voting info and more
Questions about this race

Who is running for Arapahoe County Treasurer in 2026?

One candidate is tracked for Arapahoe County Treasurer on the November 3, 2026 ballot: Michael Westerberg. Candidate information follows official Arapahoe County election filings; verify with the official election office linked below.

When is the Arapahoe County Treasurer election in Colorado?

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

How do I see my exact Arapahoe 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 Arapahoe County and state election office filings, last verified September 25, 2026. Bios and priorities carry their attribution inline.

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

The rest of your Arapahoe County ballot

21 tracked races in Arapahoe County, Colorado. Landed here from another county's search? Look up your own ballot below.

Also on your ballot
Arapahoe County SheriffArapahoe County CoronerColorado Senate District 21See all 21 Arapahoe County races
Candidate profiles
Michael Westerberg, full profileOfficial Colorado election office