Chicago 's bid to host the Worldcon was formally unopposed and won in balloting among the members of the 68th World Science Fiction Convention held in Melbourne , Australia , in 2010 . With only 526 ballots cast , this election had the lowest turnout since voting records began to be kept in 1974 . The voting breakdown was 447 votes for Chicago , 20 ballots expressed no preference , and there were 59 write-in votes for various sites
68th World Science Fiction Convention
68th World Science Fiction Convention
70th World Science Fiction Convention