The letters in a court case number tell you what kind of case it is, which court or division is handling it, and usually which judge is assigned. A number like 3:23-cv-00042-MLC is a compressed label: the cv marks it as a civil case, the leading digit points to a specific courthouse within the district, and the trailing letters are the initials of the judges on the case. What do the letters mean in a court case number depends on which court issued it, because federal courts, state courts, and appellate courts each use their own conventions.
The Case Type Letters
The case type code is the piece most people are trying to read. In federal courts, a short list of abbreviations covers nearly everything:
- cv — a civil case, covering contract disputes, personal injury, employment discrimination, constitutional challenges, and other non-criminal matters.
- cr — a criminal case brought by the federal government.
- mc — a miscellaneous case, used for matters that don’t fit the civil or criminal buckets, like subpoena enforcement or warrant applications.
- bk — a bankruptcy case filed under the federal Bankruptcy Code.1United States Bankruptcy Court Central District of California. Case Number, What Does It Mean
- md — a multidistrict litigation master docket, used when related lawsuits from across the country are consolidated before a single judge for pretrial proceedings.2Judicial Panel on Multidistrict Litigation and Federal Judicial Center. Ten Steps to Better Case Management – A Guide for Multidistrict Litigation Transferee Court Clerks
State courts borrow some of these and invent plenty of their own. You’ll often see DR or DM for divorce and family matters, PB or ET for probate and estate cases, CF for criminal felonies, CM for criminal misdemeanors, and JV for juvenile proceedings. Some states use CA for a civil action instead of CV. There is no single national dictionary for state codes, so the same two letters can mean different things in different courthouses.
Division and Location Letters
Many case numbers also encode where the case was physically filed. In federal courts this is usually a single digit at the front of the number, called an office code, that identifies which divisional courthouse within the district received the filing. The Central District of California, for instance, assigns separate codes for its Los Angeles, Riverside, Santa Ana, and Santa Barbara offices.3US Courts. US Courts District/Division Code Reference Table
State courts handle location similarly, but with letters more often than digits. A two- or three-character county code near the start of a case number routes the file to the right clerk’s office in systems that handle hundreds of thousands of cases a year. The exact codes depend entirely on the state.
Judge Initials at the End
The letters that trail at the end of a federal case number are almost always the initials of the judges assigned to it. A civil case may carry two sets of initials separated by a hyphen: the first for the presiding district judge, the second for the magistrate judge who handles day-to-day pretrial matters like discovery disputes. A number like 23-cv-0001-JFH-JFJ reads that way.4Northern District of Oklahoma, United States District Court. Case Assignment and Numbering
When both parties consent to have a magistrate judge handle the entire case, the number may carry only the magistrate’s initials. If the case gets reassigned, the initials change but the rest of the number stays the same.5United States District Court, Northern District of Indiana. Judge Simon – What Do the Initials After My Case Number Mean Not every court appends judge initials, but in federal practice it’s nearly universal. Bankruptcy case numbers follow the same habit: a number like 2:11-bk-12345-SK ends with the assigned bankruptcy judge’s initials.1United States Bankruptcy Court Central District of California. Case Number, What Does It Mean
Appellate and Supreme Court Numbers
Appellate case numbers drop most of the letters. Federal circuit courts of appeals typically assign a two-digit year followed by a sequential number, with no office code or case type prefix, because almost everything at the appellate level is already an appeal.
The U.S. Supreme Court runs on its own system tied to the October Term. A docket number like 24-1234 means the case was filed during the term beginning in October 2024 and was the 1,234th matter docketed that term. Cases invoking the Court’s original jurisdiction get a sequential number followed by “Orig.” in place of a term year. The Court also uses letter prefixes for certain administrative matters: “A” for emergency applications like stay requests, “D” for attorney discipline proceedings, and “S” for cases held indefinitely.6Supreme Court of the United States. Docket Search
Why the Same Letters Don’t Always Mean the Same Thing
There is no single national standard for formatting case numbers. Federal courts share a common electronic filing platform, which keeps their numbering reasonably consistent across districts, but each district still has its own office codes and local conventions. State courts are far less uniform. One state might embed the month of filing in the case number, another might encode the court type as a letter, and a third might use a completely different sequence. Neighboring counties within the same state can use different abbreviations for the same kind of case. Knowing which court issued the number is what makes the letters readable.
Looking Up a Case Once You’ve Decoded the Number
For federal cases, the PACER system (Public Access to Court Electronic Records) is the primary lookup tool. The PACER Case Locator at pcl.uscourts.gov searches across all federal district, bankruptcy, and appellate courts in one place.7PACER. PACER Case Locator You can also go directly to the specific court’s CM/ECF site for the most current filings. PACER charges $0.10 per page to view documents, capped at $3.00 per individual document regardless of length, and fees under $30 in a calendar quarter are waived entirely, so casual users often pay nothing.8PACER. PACER Pricing – How Fees Work
State courts have no single equivalent to PACER. Most state systems maintain their own online portals that let you search by case number, party name, or attorney, and the quality varies enormously. Some portals let you view full documents online for free; others show only basic docket entries and send you to the clerk’s office for copies. If you’re trying to decode a state case number, the court’s own website is the best starting point. Many clerks publish a guide to their numbering format, often tucked into a self-represented litigants section or a case information tab.