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How To Do An Illinois Business Name Search

By: Startup 101
Last Updated: November 15, 2024

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Starting a business in Illinois involves several steps, but one of the first is choosing a business name. This step is a little more complicated when setting up an LLC or corporation in Illinois because these entities must have a unique name.

To help you verify that your corporation or LLC is available, our step-by-step guide will show you how to quickly search for an Illinois business name using the Illinois Secretary of State’s business name database.

Related: Checklist To Start A Business In Illinois

Steps To Do An Illinois LLC Name Search

The process of searching for an Illinois LLC name and corporation name is the same, and in this example, we will work through the LLC name search. 

Step 1: Visit the Illinois entity name database

Step 2: Search for the business name

To search whether your LLC name is available, select the “Business Name” button and enter the name you would like to use in the “Search for” field.  In this example, we will look up the business name “Windy City Autos.”

Step 3: Review the results

When we search the registered names, we get a list of all the businesses with the words “Windy City Autos.”  To be able to register a corporation or LLC name in Illinois, the name must be distinguishable from all of the other names registered. So, if you were looking to form an LLC with this name, you wouldn’t be able to since there is already one registered.

To find more information about a registered business name, click on the link with the business name.

Clicking on the link for “Windy City Autos, LLC” brings a detailed report.

Illinois LLC Name Availability

While the name “Windy City Autos” may not be available, another variant like “Windy City Trucks” is.  Searching for those business names brings a result that says there were “No results found.”  While final approval is still with the Illinois Secretary of State, it is likely available to register. 

Available LLC Name Result

These are the basics of searching for a business name in Illinois.  Even when the name of the business you want is available, the Illinois Secretary of State will make a final determination when filing to ensure the name you picked isn’t too similar to other registered names. 

What information can be looked up in the Illinois business name database?

The business name search can find several pieces of information about the business. Some of the highlights include:

  • Company Name
  • Status: Active means the business is in Good Standing with the Illinois Secretary of State, and all reports and filing fees are up to date
  • Type of LLC: Corporation, Limited Liability Company, etc.
  • Registered Agent’s Information: An Illinois Registered Agent is the singular point of contact for the entity should a legal or tax notice be sent to the business. 
  • Principal Office: This could be the business entity’s address or where the records are stored.

Something to keep in mind is that even though each Corporation and LLC name must be unique, it may not stop someone else from using that name since business names for a sole proprietorship or partnership are not registered by the Illinois Secretary of State and are not required to be unique.  To protect your business name, consider getting a trademark.

Related: Should I trademark my business name?

Illinois Business Name Search FAQs

How do I register for an Assumed Name (Sole Proprietorships and Partnerships)

The Secretary of State Business Entity Database provides information for corporations and LLCs registered in Illinois. 

The names of Illinois sole proprietorships or general partnerships are not centralized and are registered with the County Clerk’s office in the county where the business is located. This registration is called an Assumed Name, which is also known as “Doing Business As,” DBA, Fictitious Name, or Trade Name.

What are the requirements for naming an LLC in Illinois?

In addition to being unique, the LLC’s name must include a special designator such as Limited Liability Company, LLC, L.L.C., etc., and it may not use restricted words such as bank or insurance unless the entity is licensed to operate as such.

Can an LLC name be reserved in Illinois?

If there is an Illinois business name that you want but are not ready to register the LLC, you can file the Application to Reserve a Name (Form LLC 1.15) with the Illinois Secretary of State. The name reservation will hold a name for up to 90 days.

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