The Missoula County Elections Office conducts City Elections.  Visit their website for the following information:

Voter Registration Ballot and Voting Information Candidate Information--Filing for office, reporting, etc. Information for Election Judges Election Results Frequently Asked Questions News Precincts

The Montana Secretary of State's Office maintains a My Voter Page.   You may use this service to find out:
 

If you are registered to vote Where you are registered to vote The location and directions to your polling place The status of your absentee ballot View a sample ballot.