How to Find a Case by Citation: A Step-by-Step Guide

To find a case by citation, read the cite to identify the reporter, then pull the opinion from a source that carries that reporter. A citation like 347 U.S. 483 means volume 347 of the United States Reports, page 483, which is Brown v. Board of Education. Enter the cite into a free source such as CourtListener or Google Scholar, or a paid service such as Westlaw or Lexis, and open the opinion. Confirm the case name and court match what you expected before you rely on it, because volume and page numbers collide across reporters and a single transposed digit lands you on the wrong case.

A citation is an address. Once you can read the parts, finding the case is mechanical, and the skill that actually matters is knowing which source carries the reporter you are looking at and how to confirm you landed on the right opinion. This guide walks through both.

How do I read a citation before I look it up?

Every reporter citation has the same three-part core: volume, reporter, page. In 550 U.S. 544, the 550 is the volume, U.S. is the reporter abbreviation for the United States Reports, and 544 is the page where the opinion begins. The parenthetical at the end tells you the court and the year, which you need because volume and page numbers repeat across different reporters. Volume 550 exists in the U.S. Reports, the Federal Reporter, the Southern Reporter, and dozens of others, and they are entirely different books.

The reporter abbreviation is the key that tells you where to look. A few you will meet constantly:

• U.S. is the United States Reports, the official reporter for the Supreme Court of the United States.
• F.3d and F.4th are the Federal Reporter, carrying the U.S. Courts of Appeals.
• F. Supp. 3d is the Federal Supplement, carrying the U.S. District Courts.
• Regional reporters like So.3d, N.E.3d, A.3d, S.W.3d, and P.3d carry state appellate opinions grouped by geography.

If you want the full anatomy of a cite, including pinpoint pages, parallel citations, and subsequent history, we break every part down in how to read a legal citation. For finding the case, the volume, reporter, and page are all you need.

How to find a case by citation, step by step

The sequence is the same whether you use a free source or a paid one.

1. Identify the reporter. Read the abbreviation in the middle of the cite and figure out which court and which book it points to. This tells you whether you are looking for a Supreme Court case, a federal appeals case, or a state appellate case, which narrows where you search.

2. Choose a source that carries it. Google Scholar and CourtListener both carry U.S. Supreme Court, federal, and state appellate opinions and let you paste a citation straight into the search box. Westlaw and Lexis carry the same opinions with headnotes and a citator on top. For a cite you already have, the free sources are usually the fastest way to the text.

3. Enter the citation exactly. Type the volume, reporter, and page as they appear, for example 410 U.S. 113. Most tools recognize a citation and take you directly to the opinion rather than running a keyword search. If nothing comes up, check the reporter abbreviation first, since a wrong abbreviation is the most common reason a lookup fails.

4. Confirm you have the right case. Read the case name, the court, and the year against what you expected. Citations get miscopied, and a one-digit slip in the volume or page can land you on a real but unrelated opinion. The case name and court are your check that you found the case you were actually looking for.

5. Pinpoint the page you need. If the cite includes a second page, as in 410 U.S. 113, 164, the second number is the pinpoint, the exact page of the proposition you care about. Jump there rather than reading from the top, especially in a long opinion.

What if the citation is to a docket number or a public-domain cite?

Not every citation points to a printed reporter. Some states have moved to public-domain, medium-neutral citation, and some cites you will encounter are to a docket rather than a reporter at all. The lookup changes slightly.

Illinois is the clearest example of public-domain citation. Since 2011, an Illinois case reads like 2019 IL App (1st) 180987, with no reporter and no page number, and pinpoints run to paragraph numbers rather than pages. You find these opinions the same way, by pasting the public-domain cite into a database, but you cite to the paragraph, not the page. A parallel cite to the North Eastern Reporter may appear alongside it and is optional.

A citation to a docket number, such as No. 21-cv-04512, points to the court's own records system rather than a reporter, which usually means the case was not reported. For federal cases, those live in the court's electronic docket. When you retrieve an older opinion this way and it comes back as a scanned image rather than searchable text, you may need to convert the document to searchable text before you can quote or pinpoint it accurately. Once you have clean text, treat it like any other unreported decision and check whether the jurisdiction lets you cite it.

Free vs paid sources for finding a case by citation

For a cite you already have in hand, a free source is almost always enough to read the opinion. The paid tier earns its cost on the two things the free sources do not do: telling you whether the case is still good law, and helping you find the controlling case when you do not have a cite yet. If your work is mostly the second kind, describing an issue and getting back the opinions that answer it, a plain-English case law search is a better fit than paging through a reporter.

How do I confirm the case is still good law after I find it?

Finding the opinion is only half the job. A case can be perfectly real, sit at the exact citation you looked up, and still be worthless because a later court overruled it or the legislature superseded the statute it interpreted. Before you rely on anything you pull by citation, run a treatment check: has any later court reversed, overruled, distinguished, or criticized it, and is it still published. We cover the full process in how to Shepardize a case and how to check if a case is still good law.

The order matters. Find the case, confirm it is the right one, then confirm it is still good law, and only then put it in a brief. Each step catches a different failure, and the citation lookup, the part that feels like the whole task, is only the first of the three.

The bottom line

To find a case by citation, read the reporter abbreviation to learn which court and book the cite points to, paste the cite into a free source like Google Scholar or CourtListener or a paid service like Westlaw or Lexis, and confirm the case name and court match before you rely on it. Public-domain cites and docket numbers work the same way with small adjustments. The lookup is quick; the discipline is confirming you have the right case and that it is still good law before it goes anywhere near a filing.

Related reading: how to read a legal citation, how to find case law, and published vs unpublished opinions. Jurisdiction guides: Illinois case law search and New York case law search.