| Year |
Employer |
Vendor Name |
Amount |
Source |
| 2024 |
State Board Of Education |
North Palos School Dist 117 |
$36,350,864.23 |
Illinois State Checkbook |
| 2023 |
Revenue |
Addison Village Treasurer |
$36,316,498.19 |
Illinois State Checkbook |
| 2022 |
Innovation And Technology |
Dell Marketing Lp |
$36,252,584.32 |
Illinois State Checkbook |
| 2018 |
Revenue |
Metrpltn Water Rclm Dist Of Ch |
$36,241,146.07 |
Illinois State Checkbook |
| 2022 |
State Employees' Retire System |
Treasurer Office Of |
$36,171,258.57 |
Illinois State Checkbook |
| 2020 |
Transportation |
Walsh Construction Co Ii Llc |
$35,978,485.72 |
Illinois State Checkbook |
| 2022 |
State Board Of Education |
Community Unit District No 203 |
$35,899,682.57 |
Illinois State Checkbook |
| 2021 |
Revenue |
Normal Town Treasurer |
$35,889,782.68 |
Illinois State Checkbook |
| 2018 |
Environmental Protect Agency |
Illinois Envrnmntl Prot Agency |
$35,885,778.05 |
Illinois State Checkbook |
| 2018 |
Healthcare & Family Services |
Presence Saints Mary And |
$35,867,531.37 |
Illinois State Checkbook |
| 2017 |
State Board Of Education |
Belvidere Community Unit |
$35,838,737.38 |
Illinois State Checkbook |
| 2017 |
Transportation |
Ihc Construction Companies Llc |
$35,829,842.48 |
Illinois State Checkbook |
| 2019 |
Revenue |
Mchenry County Treasurer |
$35,826,331.09 |
Illinois State Checkbook |
| 2024 |
Revenue |
Niles Vilalge Treasurer |
$35,814,401.02 |
Illinois State Checkbook |
| 2022 |
Revenue |
Oak Lawn Village Treasurer |
$35,802,835.01 |
Illinois State Checkbook |
| 2023 |
State Employees' Retire System |
Treasurer Office Of |
$35,795,373.30 |
Illinois State Checkbook |
| 2024 |
Aging |
Gareda Llc |
$35,782,187.96 |
Illinois State Checkbook |
| 2023 |
Human Services |
Misericordia Home |
$35,776,819.28 |
Illinois State Checkbook |
| 2023 |
State Board Of Education |
Stickney Township School Treas |
$35,766,803.20 |
Illinois State Checkbook |
| 2024 |
Transportation |
Advanced Asphalt Company |
$35,764,454.91 |
Illinois State Checkbook |
| 2023 |
Human Services |
Illinois Student Assstnce Comm |
$35,762,477.19 |
Illinois State Checkbook |
| 2020 |
Environmental Protect Agency |
City Of Joliet |
$35,710,907.72 |
Illinois State Checkbook |
| 2024 |
Aging |
Northeastern Illinois Area |
$35,691,294.22 |
Illinois State Checkbook |
| 2022 |
Revenue |
Downers Grove Village Treasure |
$35,678,603.06 |
Illinois State Checkbook |
| 2018 |
State Board Of Education |
Granite City Cusd 9 |
$35,670,100.53 |
Illinois State Checkbook |
| 2020 |
Transportation |
Iowa Dept Of Transportation |
$35,666,609.50 |
Illinois State Checkbook |
| 2023 |
Il Student Assistance Comm |
Southern Illinois University |
$35,635,734.85 |
Illinois State Checkbook |
| 2021 |
Revenue |
Skokie Village Treasurer |
$35,612,951.14 |
Illinois State Checkbook |
| 2023 |
State Board Of Education |
Belleville Township High |
$35,593,057.54 |
Illinois State Checkbook |
| 2020 |
State Board Of Education |
West Chicago School Dist 33 |
$35,591,186.50 |
Illinois State Checkbook |
| 2021 |
Revenue |
Cicero Town Treasurer |
$35,575,981.67 |
Illinois State Checkbook |
| 2020 |
Revenue |
Mchenry County Treasurer |
$35,533,338.01 |
Illinois State Checkbook |
| 2023 |
Il Emergency Management Agcy |
Advocate Health Care Network |
$35,508,438.27 |
Illinois State Checkbook |
| 2023 |
Healthcare & Family Services |
Carle Foundation Hospital |
$35,496,935.92 |
Illinois State Checkbook |
| 2023 |
State Board Of Education |
Community Unit School Dist 200 |
$35,487,393.32 |
Illinois State Checkbook |
| 2022 |
Revenue |
Peoria Unit Sch 150 |
$35,411,854.81 |
Illinois State Checkbook |
| 2024 |
Revenue |
St Clair County Treasurer |
$35,333,978.54 |
Illinois State Checkbook |
| 2021 |
Healthcare & Family Services |
St Johns Hospital Sisters Of |
$35,293,826.53 |
Illinois State Checkbook |
| 2021 |
State Employees' Retire System |
Treasurer Office Of |
$35,284,131.14 |
Illinois State Checkbook |
| 2024 |
Revenue |
Elmhurst City Treasurer |
$35,274,076.43 |
Illinois State Checkbook |
| 2023 |
Revenue |
Niles Vilalge Treasurer |
$35,244,221.32 |
Illinois State Checkbook |
| 2022 |
Revenue |
Des Plaines City Treasurer |
$35,218,041.17 |
Illinois State Checkbook |
| 2021 |
Healthcare & Family Services |
Osf Health Care System |
$35,217,218.90 |
Illinois State Checkbook |
| 2021 |
Transportation |
Icc Group Inc |
$35,215,719.66 |
Illinois State Checkbook |
| 2021 |
State Board Of Education |
Comm Cons School District 15 |
$35,212,354.50 |
Illinois State Checkbook |
| 2017 |
Central Management |
Health Alliance Medical Plan I |
$35,151,968.27 |
Illinois State Checkbook |
| 2023 |
State Board Of Education |
Crete Monee Community Unit |
$35,139,262.55 |
Illinois State Checkbook |
| 2024 |
Revenue |
Romeoville Village Treasurer |
$35,135,499.01 |
Illinois State Checkbook |
| 2021 |
State Board Of Education |
Schaumburg Comm Consolidated |
$35,065,173.62 |
Illinois State Checkbook |
| 2018 |
Transportation |
Howell Paving Inc |
$35,031,594.97 |
Illinois State Checkbook |
| 2021 |
Healthcare & Family Services |
Carle Foundation Hospital |
$34,964,369.37 |
Illinois State Checkbook |
| 2024 |
Revenue |
Quincy City Treasurer |
$34,948,650.81 |
Illinois State Checkbook |
| 2019 |
Transportation |
Union Pacific Railroad Company |
$34,934,545.80 |
Illinois State Checkbook |
| 2020 |
Revenue |
Decatur City Treasurer |
$34,815,105.46 |
Illinois State Checkbook |
| 2018 |
State Board Of Education |
Rock Island School Dstrct #41 |
$34,755,840.19 |
Illinois State Checkbook |
| 2018 |
Healthcare & Family Services |
Health Spring Of Tennessee |
$34,753,436.28 |
Illinois State Checkbook |
| 2020 |
Revenue |
Glenview Village Treasurer |
$34,719,844.49 |
Illinois State Checkbook |
| 2024 |
Healthcare & Family Services |
Cnsi Holdings Llc |
$34,701,121.86 |
Illinois State Checkbook |
| 2017 |
Healthcare & Family Services |
Advocate Northside |
$34,695,496.42 |
Illinois State Checkbook |
| 2019 |
Supreme Court |
Cook County |
$34,694,921.27 |
Illinois State Checkbook |
| 2022 |
State Board Of Education |
Belleville Township High |
$34,641,611.27 |
Illinois State Checkbook |
| 2022 |
Transportation |
Champaign Urbana Mass Transit |
$34,631,712.27 |
Illinois State Checkbook |
| 2019 |
Revenue |
Decatur City Treasurer |
$34,617,093.31 |
Illinois State Checkbook |
| 2020 |
State Board Of Education |
Danville Community Consolidate |
$34,596,974.32 |
Illinois State Checkbook |
| 2022 |
State Board Of Education |
Galesburg Community Unit Schoo |
$34,595,403.69 |
Illinois State Checkbook |
| 2018 |
State Board Of Education |
Dekalb Community Unit School |
$34,576,165.26 |
Illinois State Checkbook |
| 2022 |
State Board Of Education |
Community Unit School Dist 200 |
$34,555,977.53 |
Illinois State Checkbook |
| 2020 |
State Board Of Education |
Huntley Community School |
$34,531,938.07 |
Illinois State Checkbook |
| 2021 |
State Board Of Education |
Moline-Cole Valley Community |
$34,502,440.34 |
Illinois State Checkbook |
| 2022 |
Human Services |
Misericordia Home |
$34,498,274.40 |
Illinois State Checkbook |
| 2019 |
Revenue |
Glenview Village Treasurer |
$34,491,441.20 |
Illinois State Checkbook |
| 2020 |
State Board Of Education |
County Of Cook School Dist 98 |
$34,473,868.05 |
Illinois State Checkbook |
| 2019 |
Transportation |
E T Simonds Construction Co |
$34,466,085.70 |
Illinois State Checkbook |
| 2023 |
State Board Of Education |
Urbana School District 116 |
$34,457,888.11 |
Illinois State Checkbook |
| 2020 |
Revenue |
Waukegan City Treasurer |
$34,440,126.31 |
Illinois State Checkbook |
| 2024 |
Illinois Gaming Board |
City Of Des Plaines |
$34,424,046.70 |
Illinois State Checkbook |
| 2017 |
Environmental Protect Agency |
Fox Metro Water Rclmtn Dist |
$34,396,828.91 |
Illinois State Checkbook |
| 2021 |
State Board Of Education |
Board Of Education S D 100 |
$34,381,025.42 |
Illinois State Checkbook |
| 2020 |
State Board Of Education |
Regional Office Of Educ 54 |
$34,356,305.00 |
Illinois State Checkbook |
| 2019 |
State Board Of Education |
Harlem Consolidated School |
$34,348,159.48 |
Illinois State Checkbook |
| 2023 |
Innovation And Technology |
Deloitte Consulting Llp |
$34,337,233.86 |
Illinois State Checkbook |
| 2018 |
Revenue |
Mchenry County Treasurer |
$34,335,628.14 |
Illinois State Checkbook |
| 2022 |
Human Services |
The Thresholds |
$34,318,311.39 |
Illinois State Checkbook |
| 2022 |
Aging |
Medical Gear Llc |
$34,310,949.03 |
Illinois State Checkbook |
| 2023 |
Il State Toll Highway Auth |
Transystems Corporation |
$34,297,901.75 |
Illinois State Checkbook |
| 2024 |
Il Student Assistance Comm |
De Paul University |
$34,291,897.00 |
Illinois State Checkbook |
| 2017 |
Healthcare & Family Services |
Memorial Medical Center |
$34,253,755.00 |
Illinois State Checkbook |
| 2022 |
State Board Of Education |
Zion Public School Dist 6 |
$34,233,897.38 |
Illinois State Checkbook |
| 2024 |
Environmental Protect Agency |
Illinois Envrnmntl Prot Agency |
$34,222,108.13 |
Illinois State Checkbook |
| 2019 |
Healthcare & Family Services |
St Johns Hospital Sisters Of |
$34,185,038.26 |
Illinois State Checkbook |
| 2020 |
Healthcare & Family Services |
Mercy Hospital & Medical Ctr |
$34,175,670.00 |
Illinois State Checkbook |
| 2022 |
State Board Of Education |
Quincy Public Schools |
$34,165,030.88 |
Illinois State Checkbook |
| 2018 |
Transportation |
The Kilian Corporation |
$34,153,674.20 |
Illinois State Checkbook |
| 2023 |
Il State Toll Highway Auth |
Dunnet Bay Construction Co |
$34,105,172.45 |
Illinois State Checkbook |
| 2019 |
Transportation |
St Clair County Transit Dist |
$34,093,161.41 |
Illinois State Checkbook |
| 2019 |
State Board Of Education |
Community Unit School District |
$34,083,990.12 |
Illinois State Checkbook |
| 2024 |
Human Services |
Metropolitan Mayors Caucus |
$34,043,045.43 |
Illinois State Checkbook |
| 2021 |
Revenue |
Arlington Heights Treasurer |
$34,035,365.73 |
Illinois State Checkbook |
| 2024 |
State Board Of Education |
Galesburg Community Unit Schoo |
$34,028,638.45 |
Illinois State Checkbook |
| 2017 |
Healthcare & Family Services |
Rockford Memorial Hospital |
$34,008,288.13 |
Illinois State Checkbook |