EntityWire / States / Illinois
Illinois Secretary of State, Department of Business Services
Illinois business entity search
Look up a Illinois corporation, LLC, or nonprofit. Federal filings are searched on this page. The Illinois Secretary of State, Department of Business Services keeps the state registry, and the steps below show how to search it.
Federal filings searched here. The Illinois registry record is on the official site.
Illinois registry at a glance
| Registry agency | Illinois Secretary of State, Department of Business Services |
|---|---|
| Phone | 800-252-8980 |
| Address | Springfield Office: 501 S. Second Street, Room 350, Springfield, IL 62726. Chicago Office: 160 N. LaSalle Street, Chicago, IL 60601. |
| Hours | Monday to Friday, 8 a.m. to 4:30 p.m. |
| Official search | Business Entity Search |
| Registry number | File number |
How to search the Illinois registry
The Business Entity Search searches by business name, registered agent, president, secretary, manager, file number, keyword and partial word.
- Open Business Entity Search on the Illinois Secretary of State site.
- Choose a search method: business name, registered agent, president, secretary, manager, file number, keyword, or partial word.
- Enter the search term and submit the search.
- Select the entity from the results list.
- Check its status, file number, registered agent, and annual report date on the detail page.
Three numbers, three agencies
Asking for the wrong number is a common reason a search comes back empty.
| Number | Issued by | What it identifies |
|---|---|---|
| Federal EIN | Internal Revenue Service | Identifies the business for federal tax. It is the same number in every state. |
| File number | Illinois Secretary of State, Department of Business Services | Identifies the entity's record in the state registry. |
| Illinois Business Tax (IBT) number | Illinois Department of Revenue | The Secretary of State links separately to guidance on the federal tax ID (FEIN) and the state tax ID (EIN/IBT). The IBT number comes from the Department of Revenue through MyTax Illinois, and the file number belongs to the Secretary of State. |
Fees and annual filings
| LLC formation | $150 (Articles of Organization, form LLC 5.5); $400 for a series LLC |
|---|---|
| Corporation formation | $150 (Articles of Incorporation), plus initial franchise tax |
| Annual filing | Annual Report |
| Annual fee, LLC | $75 |
| Annual fee, corporation | $75, plus franchise tax |
| When it is due | Due before the first day of the entity's anniversary month each year. |
| Late filing | An LLC that misses the due date goes into delinquent status. If it has not filed within 60 days it is placed in penalty status with a $100 late-filing penalty, and after 120 days of delinquency it is administratively dissolved. |
| Filed with | Illinois Secretary of State, Department of Business Services, online or on paper |
| Corporate franchise tax | Illinois Secretary of State. Paid with the corporation's annual report; an initial franchise tax is paid at incorporation. Applies to corporations, not LLCs. The amount depends on paid-in capital; the rate and exemption were not read on an official page for this file. |
Expedited service is extra and must be requested in person in Springfield or Chicago. Expedited fees are in addition to filing fees, franchise taxes, penalties, and interest.
As published by the Illinois Secretary of State, Department of Business Services, checked 2026-10-06. Fees change, and the official schedule decides.
Forming or running a business in Illinois
Illinois entities keep a registered agent and registered office on file, and changes are made by filing form LLC 1.36/1.37 ($25) or the corporate equivalent.
Illinois businesses on file
The largest organizations with a Illinois address in the federal filings searched here, biggest first.
- AAR CORP.EIN 36-2334820
- OIL-DRI CORPORATION OF AMERICAEIN 36-2048898
- GEO SPECIALTY CHEMICALS, INC.EIN 34-1708689
- UNITED AIRLINES, INC.EIN 74-2099724
- AMERICAN LUNG ASSOCIATIONEIN 13-1632524
- ABBOTT LABORATORIESEIN 36-0698440
- MCDONALDS CORPORATION AND SUBSIDIARIESEIN 36-2361282
- DEERE & COMPANYEIN 36-2382580
- ABBVIE INC.EIN 32-0375147
- PACTIV LLCEIN 36-2552989
- US FOODS, INC.EIN 36-3642294
- KRAFT HEINZ FOODS COMPANYEIN 25-0542520
- W. W. GRAINGER, INC.EIN 36-1150280
- CONAGRA BRANDS, INC.EIN 47-0248710
- ILLINOIS TOOL WORKS INC.EIN 36-1258310
- DISCOVER FINANCIAL SERVICESEIN 36-2517428
- MOTOROLA SOLUTIONS, INC.EIN 36-1115800
- BRUNSWICK CORPORATIONEIN 36-0848180
- R. R. DONNELLEY & SONS COMPANYEIN 36-1004130
- TRIBUNE MEDIA COMPANYEIN 36-1880355
- PACKAGING CORPORATION OF AMERICAEIN 36-4277050
- SP PLUS CORPORATIONEIN 16-1171179
- R1 RCM HOLDCO, INC.EIN 02-0698101
- ARCHER DANIELS MIDLAND COMPANYEIN 41-0129150
Sources
Facts on this page come from the official pages below, checked 2026-10-06. A fact that could not be confirmed on an official page is left out.
- www.ilsos.gov/departments/business-services.html
- apps.ilsos.gov/businessentitysearch/
- www.ilsos.gov/publications/business-services/llc.html
- www.ilsos.gov/publications/business-services/dfc.html
- www.ilsos.gov/content/dam/publications/pdf_publications/c334.pdf
- www.ilsos.gov/departments/business-services/annual-reports/llc-instructions.html