Video shows crowds march and dance on Michigan Avenue in the Loop overnight.
Plenty of Mexican flags were on display to celebrate the country's independence.
There was a heavy police presence and some street closures in effect, but Chicago police did not report any problems.
Rogers Park Business Alliance will got a celebration at the Camino Clark corridor from Howard Street to Devon Avenue. The event begins at 2 p.m. and will have performances from Mariachi Mexico Lindo.
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In 1810, Catholic priest Miguel Hidalgo y Costilla called on his parishioners to join him in a rebellion against Spanish rule, marking the beginning of the Mexican War of Independence.
AP News contributed to this report.
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