The 1966 Ohio State Treasurer election was held on November 8, 1966, to elect the Ohio State Treasurer. Primaries were held on May 3, 1966. Republican incumbent Ohio State Treasurer John D. Herbert won re-election in a landslide, defeating Democrat Eldon Brown by seventeen percentage points.
Republican primary Candidates John D. Herbert, incumbent Ohio State Treasurer (1963–1971) Campaign Herbert won renomination unopposed. Results
Democratic primary Candidates Eldon Brown, State Examiner in Ohio State Auditor office Michael E. Entinger Campaign Eldon Brown easily won the Democratic nomination over Michael E. Entinger, winning by 20 percentage points. Results
General election Candidates John D. Herbert, incumbent Ohio State Treasurer (1963–1971) (Republican) Eldon Brown, State Examiner in Ohio State Auditor office (Democratic) Results
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