Voters in Rochester will narrow down the field of candidates in races for mayor, city council and Olmsted County Board. Primary Elections for Rochester Mayor, City Council & Olmsted County BoardEight candidates are in the field for Rochester Mayor. Meet the CandidatesThe fifth ward is the only one of the three Rochester City Council races on the ballots this year to host a Primary. Two of the three races for the Olmsted County Board require Primary Elections. Statewide Primary Races in MinnesotaMinnesota voters will also narrow down the candidates in several statewide races.