Illinois Case Law Search: Search Illinois Case Law, Court Opinions, and Precedent
Illinois threw out its printed official reports in 2011 and moved to a public-domain citation everyone can link to. Ask your question in plain English and get the on-point Illinois authority back with the holding and a citation you can check.
How courts have ruled
Sample results, illustrative only. Informational research, not legal advice. Verify every citation.
In short
Illinois case law search means finding opinions of the Supreme Court of Illinois and the five districts of the Illinois Appellate Court that decide the issue in front of you. With Cases you describe the question in plain English, such as whether an Illinois restrictive covenant survives without adequate consideration, and you get on-point Illinois precedents back as headnote cards with a plain-English summary, the holding, and a real citation you confirm at the source. Two Illinois rules shape the search. First, on binding effect, State Farm Fire and Casualty Co. v. Yapejian, 152 Ill. 2d 533 (1992), holds that an Appellate Court decision binds the circuit courts throughout the state, not only the circuits inside that district, so long as no other district has decided the issue the other way. When districts do conflict, a circuit court follows the district it sits in. Second, on citation form, Illinois assigns every opinion filed after July 1, 2011 a public-domain designator and numbered paragraphs, so the official cite is a form like 2011 IL App (1st) 101234 rather than a page in a bound volume. Cases is informational research, not legal advice. Verify every citation before you rely on it.
Who binds whom
Which Illinois court binds your case, and where the opinion is published
| Court | Precedential weight | Reporter |
|---|---|---|
| Supreme Court of Illinois | Highest court. Binds every court in Illinois. | Public-domain cite (e.g. 2011 IL 102345), parallel N.E.3d and Ill. Dec. |
| Illinois Appellate Court | Five districts. A decision binds circuit courts statewide unless another district conflicts. | Public-domain cite (e.g. 2011 IL App (1st) 101234), parallel N.E.3d |
| Circuit Courts | Trial courts, 25 judicial circuits. Cook County is its own circuit. Decisions are not binding precedent. | Generally unreported |
| Seventh Circuit and U.S. district courts | Bind on federal questions. Persuasive only on questions of Illinois law. | F.4th, F. Supp. 3d |
Example citation format: State Farm Fire and Casualty Co. v. Yapejian, 152 Ill. 2d 533 (1992). Learn to read the parts in our guide to reading and writing legal citations.
How to search
Three steps from a Illinois legal question to an on-point case you can cite
01
Ask the question, not the keyword
Describe the Illinois issue the way you would explain it to a colleague. No terms and connectors, no proximity operators, no guessing at the phrasing a headnote editor used.
02
Read the holding on the card
Each result comes back as a headnote card with a plain-English summary and the holding, so you can tell in seconds whether the case is on point before you open the full opinion.
03
Verify the citation at the source
Every card shows a real citation. Confirm it in the official reporter and check it is still good law. You stay the gatekeeper on anything that goes into a filing.
Where it earns its keep
Illinois research areas where finding the on-point case is the whole job
Restrictive covenants and trade secrets
Illinois requires adequate consideration for a restrictive covenant, and the Freedom to Work Act sets a wage floor for non-competes, so older authority has to be checked against the current statute before you lean on it.
Biometric privacy under BIPA
The Biometric Information Privacy Act produces some of the most active litigation in the country, and the Illinois Supreme Court decisions on claim accrual and damages discretion changed the exposure math, which makes recency checks essential here.
Insurance coverage
Illinois has a deep body of coverage authority, from the duty to defend and the eight-corners approach to the conflicts among appellate districts that Yapejian itself was about.
Free Illinois case law sources, and where they run out
You can read Illinois appellate opinions for nothing. The state courts publish them, Google Scholar indexes them, and CourtListener carries them with a usable search. If you already know the case you want, a free source will get you the text in under a minute, and there is no reason to pay for that.
Free sources run out in two places. The first is finding a case you do not already know about: keyword search over raw opinion text rewards whoever guesses the court's vocabulary, and a Illinois opinion that decides your exact issue in different words stays invisible. The second is verification. None of the free options tells you whether a case has been overruled, distinguished into nothing, or superseded by statute, which is the check that keeps a brief out of trouble.
Cases sits in the first gap. You ask in plain English, you get on-point Illinois precedent with the holding on the card, and you get a real citation to confirm at the source. It is priced on the page starting at 29 dollars per month, not quoted after a sales call like the incumbents, and you can read the honest comparison on our Westlaw alternative page. It is informational research, not legal advice, and you verify every citation before you rely on it.
Questions researchers ask
Illinois case law research, answered
How do I search Illinois case law?
To search Illinois case law, describe the issue in plain English, then work down from the Supreme Court of Illinois to the Appellate Court district that covers your circuit. Because an Appellate Court decision binds circuit courts statewide when no district conflicts, check for a split across the five districts before you rely on one. The Illinois Courts website publishes opinions free, as do Google Scholar and CourtListener. Confirm the cite at the source before filing.
Are Illinois Appellate Court decisions binding on all circuit courts?
Yes, unless another district disagrees. Under State Farm Fire and Casualty Co. v. Yapejian, 152 Ill. 2d 533 (1992), a decision of any Appellate Court district binds every circuit court in Illinois as long as no other district has decided the issue differently. Where two districts conflict, a circuit court follows the district in which it sits. Appellate districts do not bind each other.
How do I cite an Illinois case with the public-domain format?
For opinions filed on or after July 1, 2011, Illinois Supreme Court Rule 6 requires the public-domain designator and paragraph pinpoint, for example People v. Doe, 2011 IL 102345, paragraph 15, or 2011 IL App (1st) 101234 for the First District. Parallel citations to the North Eastern Reporter and Illinois Decisions are permitted but optional. For opinions filed before July 1, 2011, cite the official reports, Ill. 2d or Ill. App. 3d.
Can you cite unpublished Illinois Rule 23 orders?
For persuasive value only, and only recent ones. The Illinois Supreme Court amended Rule 23 so that orders entered on or after January 1, 2021 may be cited for persuasive purposes. They are still not precedential, and Rule 23 orders entered before that date remain outside the rule except in narrow situations such as law of the case, res judicata, collateral estoppel, and disciplinary matters.
Where can I find Illinois case law for free?
The Illinois Courts website hosts the official text of Supreme Court and Appellate Court opinions, which is exactly why the state stopped printing bound volumes in 2011. Google Scholar and CourtListener also carry Illinois appellate opinions. Free sources will hand you an opinion you already know about, but none of them tells you whether it is still good law, so a citator check stays part of the job.
Search Illinois case law in plain English
Ask the way you would say it out loud and get the on-point Illinois precedents, each with a summary, the holding, and a citation you can check. Informational research, not legal advice.