Voter Turnout by County in the 2018 Montana Senatorial Election

Nov 12, 2018
Montana Senate Voter Turnout by County

The map above shows the turnout and the candidate that won each county in the 2018 Senatorial election.  Jon Tester did not win a single county where voter turnout was high, whereas Matt Rosendale won six counties where voters turned out in droves.


  • Rosendale won six counties with very high voter turnout as opposed to Tester's none.
  • In addition, Rosendale won 23 counties with moderately high turnout as opposed to Tester's two.
  • Rosendale also won significantly more counties with moderate turnout at eight versus Tester's four.
  • Even in counties with moderately low turnout, Rosendale won five while Tester captured four.
  • Tester won the majority of the low turnout counties winning three while Rosendale only won one.


  • There may still be a few votes not counted.
  • The map is presented in an Albers equal-area conic projection.
  • The choropleth classification is based on Jenks or natural breaks.


In total, Rosendale won 43 counties as opposed to Tester's 13.  However, 13.95% of the counties he won were high voter turnout while Tester's high turnout counties make up 0% of his total counties won.  Counties with a moderately high turnout account for 53.49% of Rosendale's county wins and 15.38% of Tester's.  Moderate turnout counties account for 18.60% of Rosendale's counties and 30.77% of Tester's.  Turning over to the low end, counties with moderately low turnout account for 11.63% of Rosendale's county wins and 30.77% of Tester's.  Finally, low voter turnout counties account for 2.33% of Rosendale's wins while they make up 23.08% of Tester's.

Tester did well in urban areas, however the turnout there was lower than it was in the rural areas where Rosendale did well.  Although, Rosendale's advantage in voter turnout was not enough to overcome Tester's wins in counties with larger populations.


Montana Secretary of State.  "2018 General Election - November 6, 2018."  Accessed November 9, 2018.

Filed under: Elections