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Illinois Business Entity Search

Illinois’s business register is kept by the Illinois Secretary of State. Here is its official search and how to use it.

We don’t search Illinois’s registry yet

To find a Illinois LLC or corporation, use the official search — it’s the authoritative record.

Open the official Illinois search

Illinois Secretary of State · apps.ilsos.gov

How to search it

  1. Open the official search and choose a search by business or entity name.
  2. Type a distinctive part of the name; leave out “LLC” or “Inc.” if nothing comes up.
  3. Open the matching record to see its status, filing history and registered agent, as far as the state publishes them.

You can still check companies on USACIP

USACIP searches companies registered with the SEC, nonprofits in IRS data, federal records, and the state registries we already cover.

The official Illinois record

Registry
Illinois Secretary of State
Official search
apps.ilsos.gov

State business searches generally show a company’s legal name, entity type, status, formation date and registered agent; some also list officers or managers. Exactly what Illinois publishes is on its official record.

Choosing a name for a new Illinois LLC?

See which similar names are already registered before you file.

Business name search →

FAQ

How do I look up a business in Illinois?

Use the official business search of the Illinois Secretary of State: https://apps.ilsos.gov/businessentitysearch/.

Does USACIP search Illinois companies?

Not Illinois’s registry yet. USACIP can still find companies through SEC filings, IRS nonprofit data and federal records. For Illinois filings, use the official Illinois Secretary of State search.

How do I check if a business name is available in Illinois?

Search the name on the official Illinois Secretary of State site first: a name already on file there is a sign it may be taken. The state makes the final decision when you file or reserve the name.

State facts on this page were checked on the official sources linked above on October 7, 2026. USACIP is not affiliated with the Illinois Secretary of State.

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