Voters in 103 precincts will decide if the minimum wage in Chicago will go up to $15 a hour.
The increase would only apply to large corporations.
Chicago's current minimum wage is $8.25 an hour, which comes out to about $17,000 a year.
Some business leaders say raising the minimum wage would hurt the economy.
Early voting ends, absentee ballots accepted in person Sunday, Monday
Early voting for Tuesday's primary election has ended in Illinois.
You can still cast an absentee ballot in person Sunday or Monday.
In Chicago you can do so at the offices of the board of election commissioners on the lower level of 69 West Washington.
Hours run from 9 a.m. to noon Sunday and 9 a.m. to 5 p.m. Monday.
Tuesday, all polling places across the city and suburbs are open from 6 a.m. to 7 p.m.