- Source: 1866 Minnesota State Auditor election
- 1866 Minnesota State Auditor election
- 2022 Minnesota State Auditor election
- 2010 Minnesota State Auditor election
- 1860 Minnesota State Auditor election
- 1890 Minnesota State Auditor election
- 1857 Minnesota State Auditor election
- 1946 Minnesota State Auditor election
- 1894 Minnesota State Auditor election
- 1869 Minnesota State Auditor election
- 1878 Minnesota State Auditor election
The 1866 Minnesota State Auditor election was held on 6 November 1866 in order to elect the state auditor of Minnesota. Republican nominee and incumbent state auditor Charles McIlrath defeated Democratic nominee Nelson E. Nelson.
General election
On election day, 6 November 1866, Republican nominee Charles McIlrath won re-election by a margin of 10,383 votes against his opponent Democratic nominee Nelson E. Nelson, thereby retaining Republican control over the office of state auditor. McIlrath was sworn in for his third term on 11 January 1867.