Illinois LLC Name Search: Check Availability

Last Updated April 30, 2026 by the LLCForge Editorial Team. Verified against current state filing data and official Secretary of State sources.

Illinois sees high LLC formation volume out of the Chicago metro and downstate combined, which means popular names get claimed fast. The Secretary of State applies a distinguishability check on every Articles of Organization filing, and the standard is strict — punctuation and designator differences won’t save you. The search tool below queries the Illinois Secretary of State’s live entity records in real time, so you can rule out conflicts before paying the $150 filing fee. Illinois processes routine online filings within several business days.

Check Illinois LLC Name Availability

Search Illinois’s Secretary of State records directly below. We query the official database in real time so you don’t have to visit the state portal yourself.

Tips for Better Illinois LLC Name Search Results

The search tool above queries Illinois Secretary of State business records directly, but a few habits will help you avoid surprise rejections after you file:

Search the core name without the designator first

Leave off “LLC,” “L.L.C.,” or “Limited Liability Company” on your first pass. Illinois ignores entity designators when judging distinguishability, so “Riverbend Coffee LLC” and “Riverbend Coffee, Inc.” count as the same name for conflict purposes. Searching the core word gives you the broadest view of potential conflicts.

Test variations and singular/plural forms

Run a second and third search swapping in plurals, possessives, abbreviations, and common descriptive words like “Group,” “Services,” or “Holdings.” Illinois, like most states, treats minor differences (punctuation, articles like “the,” spacing) as not distinguishable. A name that returns no exact match might still conflict with a near-match the state considers identical.

Check active and recently dissolved entities

The results show active and recently dissolved entities. A name belonging to an admin-dissolved or recently withdrawn entity often remains protected for a window of months or years before returning to the available pool. Treat any close match as a potential block until you confirm otherwise.

Confirm against the naming rules below, not just the search

The search tool tells you what’s in the database. It doesn’t tell you whether your name violates Illinois’s restricted-words list (banks, insurance, professional services, etc.) or conflicts with a federal trademark. Read the naming rules section below before committing to a name, and run a quick USPTO trademark check too.

Lock in fast or reserve it

Illinois doesn’t hold a name for you just because you searched it. If you’re filing your Articles of Organization within the next few days, skip the reservation. If you need time to line up a registered agent or finalize an operating agreement, file a name reservation through the Illinois Secretary of State to hold the name during the reservation window detailed in the data card above.

Illinois LLC Naming Rules

Designator Requirement

Every Illinois LLC name must end with one of these: “Limited Liability Company,” “L.L.C.,” or “LLC.” Series LLCs use “Series Limited Liability Company,” “S.L.L.C.,” or “SLLC.” The designator is part of your legal name on every contract, invoice, and bank document.

You cannot use “Corporation,” “Corp.,” “Incorporated,” “Inc.,” “Limited Partnership,” or “L.P.” in an LLC name. Those signal different entity types.

Distinguishability Standard

Your name must be distinguishable on the records from every active LLC, corporation, LP, LLP, and reserved or registered name in Illinois. Distinguishable means more than a tiny tweak. The Secretary of State considers these differences insufficient:

• Adding or removing “the,” “a,” or “and”
• Changing punctuation, spacing, or capitalization
• Switching between singular and plural
• Switching between “&” and “and”
• Changing the LLC designator (LLC vs. L.L.C.)

Prohibited Words

Illinois bars words that imply a purpose your LLC isn’t authorized for. You cannot use “bank,” “banker,” “banking,” “trust,” “trustee,” “insurance,” “assurance,” “savings,” “Olympic,” or “Olympiad” without proof of regulatory approval from the relevant agency.

Words suggesting a government connection (“FBI,” “Treasury,” “State Department”) are also off-limits.

Restricted Words Requiring Approval

Some terms require sign-off from a licensing board before the Secretary of State accepts your filing. These include “medical,” “dental,” “engineering,” “architecture,” “law,” “attorney,” and other regulated profession terms. If you’re forming a Professional LLC (PLLC), you’ll file Articles of Organization for a Professional Limited Liability Company and submit a certified statement from the licensing authority.

What If Your Illinois LLC Name Is Already Taken?

Add a Geographic or Descriptive Modifier

“Lakeside Marketing LLC” taken? Try “Lakeside Marketing Chicago LLC,” “Lakeside Digital Marketing LLC,” or “Lakeside Marketing Group LLC.” Adding a real, distinguishing word usually clears the database. Don’t just add “Inc.” or swap “LLC” for “L.L.C.” That won’t satisfy the distinguishability rule.

Reserve the Name Before Someone Else Files

If you’ve cleared a name but aren’t ready to file Articles of Organization, submit Form LLC-1.15 with $25. The reservation runs 90 days and isn’t renewable. Expedited processing is available for an extra $100 if you need confirmation within 24 hours.

Standard reservations are processed by mail or in person at the Springfield or Chicago offices.

File a DBA (Assumed Name)

Your LLC’s legal name and the name on your storefront don’t have to match. Once your LLC is formed, you can file an Application to Adopt an Assumed Name (Form LLC-1.20) for $150 plus a per-year fee that depends on when in the five-year cycle you file. The assumed name lets a “Lakeside Marketing Group LLC” do business as “Lakeside Marketing” publicly.

Assumed names are renewed every five years.

Trademark Considerations

Illinois approval doesn’t grant trademark rights. If another business holds a federal trademark on a name similar to yours, even in a different state, they can demand you stop using it. Run a USPTO search before you commit. For names you plan to build a brand around, consider filing your own federal trademark application after formation.

After You Confirm Your Illinois LLC Name

Once your name clears, you’re ready to file Articles of Organization (Form LLC-5.5) with the Illinois Secretary of State for $150. You’ll also need an Illinois registered agent with a physical address in the state. See our Illinois LLC state guide for filing details, and our Illinois registered agent guide for agent options.

After formation, get a federal EIN from the IRS, draft an operating agreement (use our Illinois operating agreement guide), and open a business bank account. The full step-by-step is in how to start an LLC in Illinois.

Frequently Asked Questions

How do I know if my Illinois LLC name is actually available?

Run the name through the Secretary of State search at ilsos.gov/corporatellc, test variations (drop articles, change punctuation, swap singular/plural), and confirm no exact or near-exact match exists in Active or recently Dissolved status. Final approval only happens when the state accepts your Articles of Organization. The pre-filing search is a strong indicator, not a guarantee.

How long does an Illinois name reservation last?

90 days. Illinois doesn’t allow renewal. If your reservation expires before you file, you’d need to submit a new application and pay $25 again, assuming the name is still available.

Can my LLC name and DBA be different in Illinois?

Yes. Your LLC’s legal name (the one on your Articles of Organization) and your DBA (assumed name) can be completely different. File Form LLC-1.20 after formation. The fee is $150 plus a per-year amount based on the five-year renewal cycle.

Does my LLC name have to match my domain name?

No. The state doesn’t care about your domain. But practically, matching your LLC name to a .com you control makes branding and email simpler. Check domain availability before you file so you’re not stuck with “lakesidemarketingofchicago.net.”

What does “distinguishable on the record” actually mean in Illinois?

It means the Secretary of State staff, looking at your proposed name next to existing names, can tell them apart by more than punctuation, articles (“the,” “a”), spacing, plurals, or the LLC designator itself. “Smith Consulting LLC” and “Smith Consulting Inc.” are not distinguishable. “Smith Consulting LLC” and “Smith Strategy Consulting LLC” usually are.

Can I use the name of a dissolved Illinois LLC?

Sometimes. Voluntarily dissolved entities release their name back to the pool, but if dissolution was recent the name may still appear too similar to staff reviewing your filing. Involuntarily dissolved entities can technically reclaim their name within five years of dissolution, which is a reason to avoid those names. When in doubt, pick a different name or call the Department of Business Services at 217-524-8008 before filing.

This content is for informational purposes only and does not constitute legal or tax advice. Always consult a qualified professional for guidance specific to your situation.