Illinois Business Entity Search
By Edmond Hui · Last updated October 5, 2026
The short answer. The Illinois Secretary of State (Department of Business Services) keeps Illinois's register of business entities. The official search is the state's “Business Entity Search” page, on apps.ilsos.gov. We have not confirmed whether the state charges to search, so check the search page itself.
Illinois Business Entity Search at a Glance
| Register kept by | The Illinois Secretary of State (Department of Business Services) |
| Official search | Business Entity Search |
| Cost to search | Not confirmed |
| Search by | Entity name; registered agent or registered office; officer or principal; entity or filing number |
| Filed documents online | Not confirmed |
| Copy fee | $25.00 per document (see Documents) |
| Certifying a copy | See Documents |
| Name reservation | Not confirmed |
| Name reservation fee | $25.00 |
| Bulk data | Available, for a fee |
Read from the government sources listed at the foot of this page, last checked October 5, 2026. See the sources.
How to Search Illinois's Register
The official search is the state's “Business Entity Search” page, on apps.ilsos.gov. We have not confirmed whether the state charges to search, so check the search page itself. Open the official search.
On the main search page you can search by:
- Entity name
- Registered agent or registered office
- Officer or principal
- Entity or filing number
What a Search Result Shows
An Illinois result includes the items below, according to the state's own pages or a result page we read. It may show more.
- Formation or registration date
- Registered agent or registered office
- Status
- Officers or managers
What Each Illinois Status Means
The status is the label the register puts on each entity. Where the state defines a label, the meaning below restates that definition, with a link to the state page it comes from. Where it does not, we do not guess from the word, because the same word can mean different things in different states.
We have not confirmed which status labels Illinois's register uses; check the search page for an entity's status and what it means.
If the search shows that your own LLC was dissolved, see how to reinstate an LLC in Illinois.
A search result is not a certificate of good standing. If a bank or another state asks for one, see how to get an Illinois certificate of good standing.
Viewing and Ordering Documents
We have not confirmed whether filed documents can be viewed online; check the search page.
A copy of an LLC document costs $25.00, and the statute prices a certified copy the same.
Is the Name Available?
The state tells you to use this same search to check whether a name is already in use.
The state's naming standard, in its own words: “distinguishable when containing a difference from other names on the record.”
We have not confirmed whether Illinois requires a name reservation before you file. A name reservation costs $25.00.
Our free LLC name checker looks up domain and social media handle availability for a name. It does not search Illinois's register, so check the state's search as well.
Bulk Business Entity Data
Illinois offers bulk business entity data for a fee. The Department of Business Services sells its business entity information under contract rather than through the search page.
Ready to form? See what goes on the Illinois articles of organization.
Frequently Asked Questions
This guide is general information, not legal or tax advice, and reading it does not create an attorney-client relationship. It reports what each state's business entity filing office publishes about searching its register, with the sources this page cites. It cannot tell you whether a particular business is active, authorized or reliable: read the state's own record for that, and search tools, status labels and fees change between our reviews. Confirm anything you rely on with the filing office named on this page before you act on it.
Sources
Each entry below is a document recorded in our verified Illinois sources, and each entry says what the document is. Some statutory text is read from an accurate mirror rather than from the state's own host, and those say so. Where we hold the citation but no stable public link, the citation is printed on its own rather than pointed at a guessed address.
- ilsos.gov/departments/business-services/business-searches.htmlBusiness Search / Certificate of Good Standing (archived copy)
- apps.ilsos.gov/businessentitysearch/Business Entity Search (archived copy)
- ilsos.gov/departments/business-services/limited-liability-companies.htmlLimited Liability Companies (archived copy)
- ilga.gov/legislation/ilcs/fulltext.asp?DocName=080501800K50-10805 ILCS 180/50-10 Fees
- ilga.gov/commission/jcar/admincode/014/014001780A00400R.html14 Ill. Adm. Code 178.40 Sale of Information
- ilga.gov/commission/jcar/admincode/014/014001780B01350R.html14 Ill. Adm. Code 178.135 Distinguishable: Defined
- ilga.gov/commission/jcar/admincode/014/014001780B01050R.html14 Ill. Adm. Code 178.105 Preliminary Determination of Availability
- Name standard: 14 Ill. Adm. Code 178.135
Edmond Hui · Founder, MyStateLLC
Edmond Hui is a software engineer and serial entrepreneur based in New York who has founded multiple online businesses across e-commerce, media, and information publishing. Before transitioning into tech, he spent years as a commercial real estate professional closing deals totaling over 100,000 square feet, giving him firsthand experience with business formation and entity structuring. He built MyStateLLC to provide the free, state-specific LLC guidance he wished existed when forming his own companies.