How do I check LLC name availability in Illinois?
Use the Illinois Secretary of State's free Business Entity Search at https://apps.ilsos.gov/businessentitysearch/. Your proposed name must be distinguishable from existing domestic and foreign LLCs, corporations, assumed names, and reserved names on file (805 ILCS 180/1-10). If available, reserve the name for 90 days by paying a $25 fee.
Conducting Your Search
Access the Secretary of State's searchable database instantly at no cost. The search covers all registered LLCs, corporations, assumed names (DBAs), and reserved names. Search multiple variations of your proposed name to ensure no conflicts exist—the tool is case-insensitive but checks similar variations.
Your LLC name must include a required designator: "Limited Liability Company," "LLC," or "L.L.C." (805 ILCS 180/1-10).
Naming Restrictions
Certain words are prohibited or restricted without regulatory approval, including: Corporation, Corp., Incorporated, Inc., Ltd., Co., Limited Partnership, LP, Insurance, Assurance, Bank, Banker, Banking, Trust, Trustee, and Fiduciary (805 ILCS 180/1-10; 205 ILCS 620/1-9; 205 ILCS 5/46).
If your desired name is unavailable or contains restricted words, consider variations or alternative names. The search tool identifies conflicts before you file Articles of Organization.
Reserving Your Name
If your search confirms availability, file a name reservation with the Secretary of State for $25.00. This reserves the name for 90 days while you prepare your Articles of Organization, preventing others from registering it.
File your reservation online at https://apps.ilsos.gov/llcarticles/index.jsp or contact the Limited Liability Division at (217) 524-8008.
Operating Under a Different Name
If you plan to operate under a name different from your LLC's legal name, you must file an Assumed Name (DBA) with the Secretary of State for $120.00. This protects your business identity statewide.
Contact Information
Illinois Secretary of State
Department of Business Services, Limited Liability Division
Phone: (217) 524-8008
Website: https://www.ilsos.gov/
This is general information, not legal advice.