The Chicago Election Board is working to get voters registered before the deadline at midnight Tuesday night.
The board was open during the holiday Monday. But they closed at 5 p.m.
It will be open Tuesday from 8 a.m. until midnight.
If you're not sure whether you're registered you can check online http://www.chicagoelections.com/
Cook County voters can find information at www.cookcountyclerk.com/elections/pages/default.aspxon. Statewide voter information is available at the Illinois State Board of Elections website: www.elections.il.gov.