Identify the case you want to search. The easiest way to find a case is by its citation. A citation for a Supreme Court case is commonly in this format: United States v. Booker, 543 U.S. 220 (2005). This means the United States and Booker were the parties; that the case is located in volume 543 of the United States Reporter on page 220; and that the case was decided in 2005. You also can search cases by the parties involved or subject matter.
Locate an Internet legal research database that contains Supreme Court cases. There are multiple free websites such as FindLaw, The Oyez Project, the Cornell Law School Legal Information Institute, and the Supreme Court's website. There are also some legal research websites that require you to purchase a subscription package, or pay a fee on a per search basis. Sites likeWestlaw, LexisNexis, and Loislaw can be expensive, but they provide other services including whether the decisions have been overturned and summaries of cases.
Search for the case using the legal research website database's search or browse function. The search function allows you to search by case citation, party name, or text. You can search by subject but you may spend a considerable amount of time looking for the exact case. You can browse for a case by year or volume number.