Malden, Mark, Marseilles, McNabb, Naplate, North Utica, Oglesby, Ottawa, Peru, Seatonville, Spring Valley, Standard, Streator, Tonica, and Troy Grove. The district has been represented by Democrat Lance Yednock since January 9, 2019. Travis Breeden, a feeder driver with UPS, is running for the Republican nomination.

District 77
The 77th district, located in the Chicagoland area, includes all or parts of Addison, Bellwood, Bensenville, Berkeley, Des Plaines, Elk Grove Village, Elmhurst, Franklink Park, Maywood, Melrose Park, Northlake, Rosemont, Stone Park, Villa Park, and Wood Dale as well parts of the Chicago neighborhood of O'Hare. The district has been represented by Democrat Kathleen Willis since January 9, 2013. Anthony Airdo, a sales director and candidate for the district in 2018, is running for the Republican nomination.

District 78
The 78th district, located in theopen. Dagmara "Dee" Avelar, a community activist, is running for the Democratic nomination. Ron Doweidt, the Republican Precinct Committeeperson for DuPage 020 Precinct, is running for the Republican nomination.

District 86
The 86th district, located in the Chicagoland area, covers all or parts of Channahon, Crest Hill, Elmwood, Ingalls Park, Joliet, New Lenox, Preston Heights, Rockdale, and Shorewood. The district has been represented by Democrat Larry Walsh Jr. since his appointment in April 2012.

District 87
The 87th district, located within the Springfield metropolitan area, includes all or parts of Armington, Athens, Atlanta, Beason, Broadwell, Buffalo, Cantrall, Chestnut, Clear Lake, Cornland, Dawson, Delavan, Elkhart, Emden, Grandview, Green Valley, Greenview, Hartsburg, Hopedale, Illiopolis, Lake Petersburg, Latham, Lincoln, Mechanicsburg, Middletown, Minier, Morton, Mount Pulaski, New Holland, Oakford, Pekin, Petersburg, Riverton, Rochester, San Jose, Sherman,