Emanuel, President Obama's former chief of staff, has about $2.1 million left in his campaign fund, the Chicago Tribune reported.
Emanuel spokesman Ben LaBolt said the money remaining in the campaign account is "only an estimate because we have subtracted what we know are the outstanding expenditures, but there could be something we are missing and the final report with all of the expenditures is not immediately due."
Some of the remaining money could be used in 14 aldermanic runoff races, the report said.
Much of Emanuel's campaign funds came from large donations before Jan. 1, when a state law set fundraising limits.
Candidate Gery Chico finished a distant second in the mayoral race.