Sixty percent of Michigan's nearly 7.2 million registered voters are expected to cast ballots in next week's general election.
Secretary of State Terri Lynn Land's prediction that four and a half million voters will turn out on Tuesday is slightly higher than the 4.3 million who went to the polls in the 2000 presidential election.
Since 2000, nearly 305,000 voters have registered.
Land attributed the increase to a number of factors, including high interest in the presidential election, two significant statewide ballot proposals, and extended media coverage of the campaigns.
The polls are open from 7 a.m. to 8 p.m. on Tuesday.