The Clerk's office registers business names known as "assumed names" (or DBA) for new businesses in accordance with Illinois law.

An assumed name is issued to any business entity that uses a name other than the name(s) of the individual(s) who own or operate the business. For example, a business called "John Jones, P.C." (i.e. owner's full name and title) does not have to file an assumed name, but "Jones Wrecking" does.

Required Business Registrations

Under state law, three classes of businesses are required to register assumed names with the local county clerk's office. The business classifications listed below are defined fully in the Illinois Compiled Statutes.

Businesses required to register:

  • Sole proprietorships
  • General partnerships
  • Professional services corporations

Businesses not required to register:

  • Limited liability companies
  • Limited liability partnerships
  • Limited partnerships
  • Corporations

For more information on who must register an assumed business name, see the Clerk's site:http://cookcountyclerk.com/vitalrecords/busnamereg/Pages/Whoisrequiredtoregister.aspx

More Information

The Clerk's site allows you to:

  • Apply online to register or amend an assumed business name
  • Search for an assumed business name