Missouri › St Louis County › Missouri House District 90
One candidate is tracked for Missouri House District 90 on the November 3, 2026 ballot: Mark Boyko. Candidate information follows official St Louis County election filings; verify with the official election office linked below.
Mark Boyko (Democratic) is the only nominee on the November 3 ballot; Mark Boyko is the sitting member per the House roster. Missouri has no runoffs; the August 4 primary winner of each party is the nominee, and unopposed nominees still print. The field is the Missouri Secretary of State's certified general election candidate list (certified August 25, 2026). This seat is elected by district; only the district covering your address appears on your ballot.
Democratic · Incumbent
Mark Boyko has practiced law for twenty years, primarily as an ERISA litigator, per his official House biography. He has served on the Kirkwood School Board and as a director for the St. Louis Area Diaper Bank. He is the Democratic incumbent for Missouri House District 90. No campaign website or questionnaire response was found as of September 6, 2026.