The Ballot Brief
Ada County, Idaho

Ada County Assessor

IdahoAda County › Ada County Assessor

2 candidates are tracked for Ada County Assessor on the November 3, 2026 ballot: Erik Olson and Rebecca W. Arnold. Candidate information follows official Ada County election filings; verify with the official election office linked below.

2 candidates are on the November 3, 2026 ballot for Ada County Assessor, per the Idaho Secretary of State's candidate filing portal.

Erik Olson

Democratic

Erik Olson is on the November 3, 2026 ballot for Ada County Assessor, per the Idaho Secretary of State's candidate filing portal. This name has not yet been researched.

Rebecca W. Arnold

Republican

Rebecca W. Arnold is on the November 3, 2026 ballot for Ada County Assessor, per the Idaho Secretary of State's candidate filing portal. This name has not yet been researched.

Questions about this race

Who is running for Ada County Assessor in 2026?

2 candidates are tracked for Ada County Assessor on the November 3, 2026 ballot: Erik Olson and Rebecca W. Arnold. Candidate information follows official Ada County election filings; verify with the official election office linked below.

When is the Ada County Assessor election in Idaho?

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

How do I see my exact Ada 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 Ada County and state election office filings. Bios and priorities carry their attribution inline.
Cross-check with the official Idaho election office, or see the full Ada County sample ballot and your exact ballot by address.