Illinois Secretary of State (SOS) Business Entity And Corporation Search

Last Updated on February 19, 2021

Illinois state map

Illinois Business Corporation Registry Search

The Secretary of State of Illinois maintains one of the country’s largest databases which contain information on hundreds of thousands of business entities, primarily including Corporations and Limited Liability Companies (LLCs).

The business database also has information regarding the following entities:

  • Corporations
  • Not-for-Profit Corporations
  • Limited Partnerships
  • Limited Companies
  • Limited liability Companies

How to do an Illinois Business Entity Search

To do your search for a business entity, you need to know to have at least one of the following information with you:

  • Name
  • Keyword
  • Partial Word
  • File Number

To make your search easier, we have created an easy-to-follow guide for you below.

Step 1 – Visit the Illinois Secretary of State’s website (it will look like the screenshot below).

illinois business entity and corporation search

Step 2 – Choose what type of business entity you are searching for. In this example, we’ve selected “Corporate and LLC”.

Illinois search by entity name

Step 3 – Next, choose any of the search methods provided. In this example, we’ve chosen to search by name.

Step 4 – Now enter the Business Entity name in the field. For our sample name, let us type in “Exelon“, then click the “Submit” button.

Business entity search result

Step 5 – The Results Page will then appear (see the screenshot below for reference).

Company Details

Click on the business entity’s name to access more information including its:

  • Legal Name
  • Status
  • Entity Type (Corporation, Limited Liability Company, etc)
  • Registered Agent Information
  • Annual Report Filing Date
  • File Number
  • State of Formation (If the result is Illinois, it is a domestic entity, while an out-of-state result is a foreign entity)
  • Officer Information

Here you can also request a certificate of good standing.

Registered Agent

In Illinois, one of the requirements for a corporation or LLC is that a Registered Agent has to be named.  This person is a single point of contact in case the business needs to be served with legal papers or contacted by the state. One of the business owners often file as the entities Registered Agent. When they file, their home address is often used (PO Boxes aren’t allowed) and the owner's name and address is now a public record that can be looked up by anyone. This can be a big concern, especially for home-based businesses. Using a commercial Registered Agent service will keep their personal address from being public record..

Business Licenses

The business name registration is different from business licensing in Illinois.  The Illinois Department of Revenue has more information regarding Illinois business licenses.

Information on the Illinois (IL) SOS

Illinois sos seal


As the second largest constitutional office of the state, the Secretary of State of Illinois is also an elected governmental institution.

The Secretary of State of Illinois is a government office visited by more Illinois residents than any other government office in the state.

Jesse White, a Democrat, has been the incumbent office holder since 1999.


The Secretary of State of Illinois is the custodian of the public records, Illinois UCC filings and archives, state laws, state records, State Capitol and Library. Aside from registering corporations, lobbyists and notaries, he is also in charge of issuing licenses to Illinois-registered vehicles and motorists.

Secretary of State Contact Information

213 State Capitol
Springfield, IL 62756

Select the State Where the Corporation is Registered: