Case numbers generally run between about 6 and 21 characters, depending on which court assigned them. A federal appeals court number can be as short as seven characters, while a federal district court number carrying judge initials can stretch past 20. There is no single national standard for how long case numbers are, because each court builds its number from a different set of components, and each component adds length.
Typical Length by Court Type
The clearest way to answer the length question is court by court. These ranges cover the separators (hyphens, colons) that are part of the number itself.
- Federal district courts: 10 to 21 characters. Example: 2:24-cv-01234-ABC.
- Federal appellate courts: 6 to 7 characters. Example: 24-5678.
- U.S. Supreme Court: 6 to 8 characters. Example: 24-789.
- Federal bankruptcy courts: 12 to 15 characters. Example: 24-90131-LT7.
- Federal administrative tribunals: 12 to 16 characters. Example: 2024-BLA-00998.
- State courts: roughly 8 to 16 characters, with real variation from one state to the next.
Federal District Courts
District court numbers pack in the most information, which is why they run the longest. A typical number like 1:21-cv-05678-MW carries a division code, a two-digit filing year, a two-letter case-type code, a sequential filing number, and the initials of the presiding judge. Without judge initials, most district numbers land in the 10 to 15 character range. When both the district judge’s and a magistrate judge’s initials are appended, the total climbs to 18 to 21 characters.1United States District Court Northern District of Indiana. Judge Brady: What Do the Initials After Each Case Number Mean
The sequential number is the piece that varies most between districts. Federal district courts usually run four- or five-digit sequences that reset to 0001 (or 00001) each January.2United States District Court District of South Carolina. Explanation of Case Numbers Busy districts filing tens of thousands of cases a year use five digits; smaller districts get by with four.
Federal Appellate and Supreme Court
Appeals numbers are short because they carry less embedded information. Circuit courts of appeals use a yy-nnnn format: two-digit year, sequential number, nothing else.3United States Court of Appeals for the Second Circuit. Entering the Case Number and Selecting the Filing Type That’s typically six or seven characters. A circuit court handles only appeals and sits as a single unit, so there is no division code or case-type abbreviation to add.
U.S. Supreme Court docket numbers follow a similar compact format: a two-digit term number, a hyphen, and a sequential number that can be anywhere from one to five digits. So a Supreme Court number can look like 23-456 or 23-12345, generally running six to eight characters. Cases filed under the Court’s original jurisdiction get a number followed by “Orig.” instead.
Federal Bankruptcy Courts
Bankruptcy numbers include a filing year, a five-digit sequential number, the assigned judge’s initials, and the chapter under which the case was filed. A number like 16-90131-LT7 means the case was filed in 2016, was the 90,131st case, was assigned to a judge with the initials LT, and was filed under Chapter 7.4U.S. Bankruptcy Court Central District of California. What Does a Bankruptcy Case Number Mean Total length usually lands between 12 and 15 characters with separators.
Administrative Tribunals
Federal agencies that adjudicate through administrative law judges use their own formats. The Department of Labor uses a four-digit fiscal year, a three-letter program code, and a five-digit sequential number. A number like 2020-BLA-00998 identifies the 998th Black Lung Benefits Act case docketed in fiscal year 2020.5U.S. Department of Labor. What Is My Case Number These numbers run around 15 characters.
State Courts
State court numbering is the least predictable. Every state judiciary sets its own convention, and some states use different formats for each court level. Components tend to mirror the federal system, meaning filing year, case type, and a sequential number, but you’ll also see county codes, check digits, and courtroom identifiers layered in. Most state numbers fall between about 8 and 16 characters, with outliers in both directions.
What Makes a Case Number Long or Short
The length comes from how many pieces of information the court chose to embed. A court that uses a four-digit filing year produces a longer number than one using two digits. A court that includes a division code, a case-type abbreviation, and the assigned judge’s initials generates a substantially longer string than a small municipal court tracking only year and sequence.
The two-letter case-type codes in the middle of a federal number are the common ones you’ll recognize. CV means civil, CR means criminal.6U.S. District Court. The Court’s Case Numbering System MC shows up for miscellaneous matters.2United States District Court District of South Carolina. Explanation of Case Numbers Those codes are only two characters, but they’re required, and searches without them tend to return nothing.
Federal courts, state trial courts, appellate courts, bankruptcy courts, and administrative tribunals all follow different conventions. Two federal district courts in different parts of the country may arrange the same basic information in slightly different orders.
Case Numbers Are Not Docket Entry Numbers
One boundary worth flagging, because it trips up a lot of people counting characters and wondering why a number seems too short. A case number identifies the entire lawsuit or proceeding. It’s assigned once, when the case is first filed, and stays the same until the case closes. A docket entry number identifies a single filing inside that case, like a specific motion, order, or exhibit. Every new filing gets the next sequential entry number on the docket sheet.
When a clerk or attorney asks for a “docket number,” they almost always mean the case number. But “docket entry 47” points to the 47th item filed in that case. Entry numbers are usually just one to four digits, so if the number you’re looking at is much shorter than the ranges above, you may be looking at an entry number rather than the case itself.
Copy the Whole Thing, Every Time
If someone asks for your case number, give them every character, including punctuation and spacing. Dropping a division code or leaving out a hyphen can make the number unsearchable. Courts designed these strings for their own internal systems, and even a missing leading zero can send a search to the wrong case, or to no case at all.
For federal case lookups, the PACER Case Locator functions as a national index across district, bankruptcy, and appellate courts, and you can search by party name if you don’t have the number in hand.7PACER Case Locator. PACER Case Locator For state cases, start with the county court clerk’s website; most states now run online portals, though the exact format they expect (spaces, hyphens, leading zeros) varies. If a number that looks right isn’t returning results, check the formatting before assuming the number is wrong.