The 1904 Missouri State Treasurer election was held on 8 November 1904 in order to elect the state treasurer of Missouri. Republican nominee Jacob F. Gmelich defeated Democratic nominee James Cowgill, Socialist nominee Charles A. Richardson, Prohibition nominee Daniel L. Sims, People's nominee James M. Burrus and Socialist Labor nominee Otto Schwitzgebel.
General election.
On election day, 8 November 1904, Republican nominee Jacob F. Gmelich won the election by a margin of 13,253 votes against his foremost opponent Democratic nominee James Cowgill, thereby gaining Republican control over the office of state treasurer. Gmelich was sworn in as the 21st state treasurer of Missouri on 9 January 1905.
Results.
! scope="col" colspan="2" style="width: 15em" |Party
! scope="col" style="width: 17em" |Candidate
! scope="col" style="width: 5em" |Votes
! scope="col" style="width: 3.5em" |%
! colspan="3" style="text-align:right;" | Total votes
References.
 ;templatestyles src="Reflist/styles.css" / ;