Illinois Business Entity Search
Look up any registered business in Illinois — check a company's status, registered agent, or formation date, or see if a business name is already taken. Search the official Illinois registry below.
Search the Illinois registry →
Official source: Illinois Secretary of State
What you can find
- Whether a business name is already registered in Illinois
- A company's legal status (active, dissolved, etc.)
- The registered agent and principal address
- Formation/registration date and entity type
- Document filing history (where the state provides it)
How to search
- 1Click through to the official Illinois registry above.
- 2Search by business name, owner, or entity number.
- 3Open the matching record to see status, registered agent, and filings.
- 4Checking availability for a NEW name? Run it through our Business Name Search (registry + trademark + domain).
- 5Ready to register? Use our Illinois License Checklist to see exactly what you need.
Naming a NEW business? Check it with Business Name Search. Ready to launch? Get your Illinois License Checklist and your free EIN. Renting out property in Illinois? Draft a Illinois Residential Lease Agreement.
Frequently Asked Questions
- Is the Illinois business entity search free?
- Yes. The official Illinois registry (Illinois Secretary of State) lets anyone search registered businesses for free. This page links you straight to it — and we never charge for the lookup.
- Can I check if a business name is available in Illinois?
- Yes — searching the registry shows whether a name is already taken by a registered Illinois entity. If it doesn't appear, it may be available. For a full check (state registry + federal trademark + domain + social), use our free Business Name Search.
- What information does a Illinois business search show?
- Typically the entity's legal name, status (active/inactive), entity type, registered agent, principal address, and formation date — and often its filing history. The exact fields depend on what Illinois publishes.
- How do I register a business in Illinois?
- Search the registry first to confirm your name is free, then file your formation documents with Illinois Secretary of State and get an EIN. Our Illinois Business License Checklist walks the full list of registrations and permits.
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This page links you to Illinois's official business registry; it isn't a government source and doesn't store or control the registry data. The authoritative record is always at Illinois Secretary of State.