Concept
Jury Size
Right to a jury trial
Jury Size
Two sources answer the question of how many people sit on a criminal jury, and they give different answers. Rule 23(b) of the Federal Rules of Criminal Procedure sets the federal default at twelve jurors and allows fewer in only three situations. The first is a written stipulation, approved by the court, that the jury may have fewer than twelve members. The second is a stipulation that fewer than twelve may return a verdict if the court finds it necessary to excuse a juror for good cause after the trial begins. The third arises after deliberations have started, when the court finds good cause to excuse a juror and permits eleven to return a verdict even without a stipulation.1 The Sixth Amendment, which reaches state trials through the Fourteenth, asks for less. It does not require twelve, and it sets a minimum of six, below which the jury can no longer do the work the right exists to secure.
Because the rule is stricter than the Constitution, every jury-size problem splits into two questions that have to be asked separately. Rule 23(b) governs trials in federal court, while the constitutional minimum binds every court, federal and state. A federal jury of nine can therefore clear the constitutional minimum and still depart from the rule, and a state jury is tested against the constitutional floor and against its own jurisdiction's law rather than against Rule 23.
The two-layer design reflects what each source is trying to do. A larger jury serves the functions the right protects more reliably, since more voices bring more of the community's experience into the jury room, but a larger panel costs more to select and is harder to keep intact through a long trial. The federal rule resolves that tradeoff by fixing a stable default of twelve, so that every federal defendant starts from the same baseline, and then allows departures only through controlled exceptions. Each exception carries a safeguard matched to its risk. A stipulation needs the written agreement of the parties and the court's approval because a smaller panel changes the odds for both prosecution and defense, and neither side should be able to impose that change on the other. The excusal exceptions require a finding of necessity or good cause because their purpose is to rescue a trial that would otherwise be wasted when a juror drops out, and the finding keeps the exception from becoming a way to shrink the panel at will. The Constitution polices only the minimum, the point at which a panel becomes too small to deliberate well and to represent the community, and it leaves everything above that line to rules like Rule 23(b).
The trap in this area is to treat the constitutional number as the federal number. A federal jury of ten is not proper merely because the Sixth Amendment tolerates fewer than twelve, since Rule 23(b) allows ten only through one of its exceptions. The opposite mistake is to call a state jury of eight defective because it has fewer than twelve members, when the federal rule does not govern that trial and the jury clears the constitutional floor. The subsections below begin with the rule's default of twelve, turn to the constitutional floor, and then take each exception to the default in turn.
The Twelve-Person Default
Federal criminal juries start from a number fixed by one sentence of Rule 23(b)(1): a jury consists of twelve persons unless the rule provides otherwise.2 The sentence does two jobs. Its first clause sets a baseline, so every federal trial is expected to proceed with twelve jurors until something displaces that number. Its closing clause defers to the rest of Rule 23(b), which means a smaller panel is lawful under the rule only when the departure fits one of the exceptions the rule itself lists. Those exceptions, each with its own conditions, come up one at a time in the subsections below, and none of them can be assumed from the default alone.
The reason for a fixed default shows when you consider the alternative. If the rule left size to the judge's discretion in each case, the number of jurors would become one more thing for the prosecutor and the defendant to contest, because the size of a panel can affect how a verdict is reached and each side would prefer the size that suits its case. A fixed baseline removes that contest at the outset. Every federal defendant begins with the same panel, the system can plan around a known number, and a change requires someone to point to a specific provision and satisfy its conditions rather than simply ask. Size therefore cannot be negotiated informally between the parties or adjusted quietly by the court.
Twelve can look like a constitutional number because its roots are old. The common-law jury has been a panel of twelve since the mid-fourteenth century, and the Supreme Court once read the Sixth Amendment as carrying that feature with it.3 In Thompson v. Utah in 1898 the Court answered that the Sixth Amendment jury is the common-law jury of twelve, with no other number permitted, and in Patton v. United States in 1930 it listed a jury of twelve among the essential features of the Sixth Amendment jury, alongside a judge who supervises the trial and a unanimous verdict.4
That reading did not survive. In Williams v. Florida in 1970 the Court held that a six-person jury in a state criminal trial satisfied the Sixth Amendment, which binds the states through the Fourteenth. It reached that result by asking what function the number twelve performs in the jury right and concluding that the number is not an indispensable part of it.5 Justice Marshall dissented, arguing that the right includes a jury of twelve and that a smaller panel impairs the jury's purpose, but his was the losing position.6 The older decisions matter here only because they show what Williams changed. Once the Constitution stopped demanding twelve, the number became something a procedural rule could set, and that is the status of Rule 23(b)(1): a federal default that asks for more than the Sixth Amendment requires. How far below twelve the Constitution allows a jury to go is the question for the next subsection.
On an exam stem, the usual error is to treat twelve as a constitutional requirement and conclude that any federal jury of fewer than twelve violates the Sixth Amendment. A panel can depart from Rule 23(b) without offending the Constitution, so the rule question and the constitutional question have to be asked separately. The opposite error assumes that because the Constitution tolerates a smaller jury, a federal court may seat one freely. A stem that reports fewer than twelve jurors in a federal trial calls for asking which exception in the rule supplied the authority. If none did, the default was not met.
The Constitutional Floor
Rule 23(b)(1) asks for twelve jurors, but the Constitution asks for fewer, and the exact minimum comes from two decisions that make sense only in sequence. In Williams v. Florida the Court held that the twelve-person panel is not a constitutional imperative and that a six-person jury in a state felony trial satisfies the Sixth Amendment, which binds the states through the Fourteenth.8 Eight years later, Ballew v. Georgia held that a criminal jury may not consist of fewer than six jurors, so a five-member jury is unconstitutional.9 Together the two holdings leave six as the smallest criminal jury the Constitution allows, and because an incorporated right carries the same content in state and federal court, that floor binds both.10
The previous subsection showed that Williams displaced the old assumption of twelve. The reasoning that did the displacing also sets the lower limit, so it deserves a closer look. Williams was charged with robbery, a felony, and was tried before a jury of six.11 Rather than ask what the common-law jury looked like, the Court asked what the number twelve actually does for the jury, and it concluded that the figure was a historical accident unrelated to the purposes of the jury system.12 The purpose it identified is protection against government oppression: the jury places the common-sense judgment of a group of laypeople between the accused and the accuser and brings the community into the decision. That function does not depend on any particular number, but it does depend on the group being large enough to perform it, so the Court framed a functional test. The jury must be large enough to promote group deliberation, free from outside intimidation, and to give a fair possibility of a representative cross-section of the community. The Court saw little reason to think six jurors were meaningfully less likely than twelve to meet those goals.13
The two halves of that test rest on different logic, and each explains how a panel can become too small. Deliberation free from intimidation needs enough members that the discussion draws on several recollections and viewpoints and that no one or two jurors can dominate the room; as the group shrinks, the conversation thins and pressure on it becomes easier to apply. The cross-section half depends on simple odds. Each seat is another chance for some segment of the community to have a member in the jury room, so the fewer the seats, the smaller the chance that any minority viewpoint is heard. Both goals tie jury size to the jury's purpose, and a later decision on jury selection, Taylor v. Louisiana, collected Williams and other cases as recognizing that a jury must be large enough to promote deliberation and to give a fair possibility of a representative cross-section.14
Williams assumed that six jurors performed those functions about as well as twelve, but critics argued that the studies it cited did not support that conclusion, and social scientists then examined the effect of size more carefully.15 That research was available when Claude Ballew's case reached the Court. Ballew managed an Atlanta theater and was charged with two misdemeanor counts of distributing obscene materials by exhibiting a film. Georgia tried its misdemeanor cases before five-person juries, so after five jurors were seated and sworn, his motion for a jury of twelve was denied, and the jury deliberated thirty-eight minutes before convicting on both counts.16 The charge carried the label misdemeanor, but it exposed him to as much as a year in jail, which put it on the serious side of the six-month line, so the jury right applied in full.17
Ballew left Williams standing and kept the same functional test, applying it to the newer evidence. That evidence suggested four things about progressively smaller juries.18
Harm to the guarantee is only one side of the balance, and the Court also asked whether any interest of the state justified the reduction. It found none of weight. The savings from smaller juries come mainly from lower daily juror allowances, which are substantial in moving from twelve to six, while trial time shrinks little and a move from six to five saves almost nothing; only Georgia and Virginia had cut juries to five in certain non-petty cases.19 That difference is what separates the two decisions. Both apply the same test, but Williams approved a reduction that saved real money and was thought to cost the guarantee little, while Ballew rejected a reduction that threatened the guarantee more and saved the state almost nothing. The Court admitted that it could not "discern a clear line between six and five," yet held that going below six impairs the jury's purpose and functioning to a constitutional degree.20 Six therefore marks the stopping point because it is the size already approved, and every step below it adds risk to the guarantee while adding almost no saving.
State constitutions and statutes may guarantee a jury right broader than the Sixth Amendment's, which is why the federal floor and a state's own jury-size rule are separate questions.21
On an exam stem, the line to apply is the one between six and five. A jury of six or more in a non-petty prosecution raises no Sixth Amendment size problem, however far below twelve it falls, while a jury of fewer than six violates the amendment even when the state's own constitution authorizes it, as Georgia's did in Ballew.22 The floor operates only where the jury right exists, so the first question remains whether the offense is serious enough to carry a jury at all, and Rule 23(b) poses its own separate question in a federal trial.
Stipulating to a Smaller Jury
The twelve-person default gives way first to the parties' own agreement. Rule 23(b)(2) allows the parties, at any time before the verdict and with the court's approval, to stipulate in writing to certain departures from the default, and the first of them is that the jury may consist of fewer than twelve persons.24 A stipulation is a formal agreement between the parties on a point in the case, which the court then treats as settled instead of requiring proof or argument. The rule names no particular smaller number, so the figure comes from the stipulation itself, while the constitutional floor of six from the previous subsection remains a separate question that the rule does not answer.25
Each condition has its own reason. The requirement that the parties stipulate reflects who holds what: a federal defendant begins with a jury of twelve, so a smaller panel means giving up part of what the default supplies, and the defendant's agreement is what makes that surrender legitimate. The government is a party too, and because the size of a panel can affect how a verdict is reached, each side has a stake in the number. Requiring both to join keeps either from shrinking the jury alone. The writing requirement does subtler work. A smaller jury that convicts gives the defendant an obvious motive to say afterward that no agreement was ever made, and a spoken understanding between counsel leaves the record open to that dispute. A signed stipulation settles what was agreed, and by whom, before anyone knows how the trial will end. Court approval adds a check on the agreement itself, since the judge can confirm that the consent is genuine before the jury is reduced, rather than discovering a problem after a panel nobody properly agreed to has returned a verdict.
The deadline works differently from the other two conditions, because it is generous at the front and firm at the back. The phrase any time before the verdict covers the start of trial and every moment after it, which matters because the occasion for a smaller jury may arise only once the trial is underway, and the rule lets the parties respond to it then.27 The window closes at the verdict for an incentive reason. If the parties could stipulate to a size after the jury had spoken, each side could embrace or disown the panel's size in light of the result, and the number of jurors would become a tool for second-guessing outcomes. Fixing the cutoff at the verdict means the choice is always made while the outcome is still unknown to both sides.
On an exam stem, the usual trap is an oral agreement that sounds complete: both lawyers agree, the judge nods, and the jury drops to ten. The same analysis catches the other failures, which are a written stipulation the court never approved and a stipulation first offered after the verdict. In each of them one of the three conditions is missing, and the departure from twelve has no footing in Rule 23(b)(2)(A). The clause taken up next, which ties a stipulation to the excusal of a juror during trial, rests on the same written, court-approved agreement but answers a different question about when a smaller panel may decide the case.
Stipulating to Excuse a Juror
Rule 23(b)(2) uses one lead-in for both of its stipulation options, so the second runs on the same machinery as the first: the parties agree in writing, the court approves, and the agreement is made at any time before the verdict.29 What the second option adds is a particular problem to solve. Under Rule 23(b)(2)(B), a jury of fewer than twelve persons may return a verdict if the court finds it necessary to excuse a juror for good cause after the trial begins.30 The option before it let the parties agree to a smaller jury as such, which they may do from the outset. This one reaches the mid-trial emergency, in which a panel that started at full strength loses a member and the question is whether the remaining jurors may still decide the case.
The reason for the option lies in what happens to a long trial when a juror drops out. Illness, a family emergency, or a similar event can make a juror unavailable after evidence has been heard for days or weeks, and the federal default calls for twelve. Without some way to proceed, the loss of one member would leave the court with a panel the default does not recognize, and everything done so far could be wasted. A written, court-approved stipulation lets the parties accept a smaller verdict panel in advance, and the court's finding limits when that acceptance can be used.31
Each half of the clause has its own logic. The stipulation supplies consent: a federal defendant starts with the right to a jury of twelve under the default, so agreeing that fewer may return a verdict gives up part of that entitlement, and the government, which has its own stake in how the panel decides, joins in the agreement. The court's finding does subtler work. Once the parties have agreed that a smaller panel may decide, removing a juror costs a party little, and a party that suspected a particular juror was leaning the wrong way would have a motive to press for that juror's removal. The clause answers that temptation by placing the decision in the judge's hands, since the judge must find that excusing the juror is necessary and that good cause exists, and a party's preference satisfies neither requirement.32 Both findings concern the juror's situation, which is why a hospitalization can qualify and a conflict with vacation plans cannot.
The two conditions operate in sequence. The agreement can be in place before anything goes wrong, because the lead-in allows a stipulation at any time before the verdict, but until a juror is actually excused it authorizes nothing.33 It is a contingent permission: it comes into play only after the trial has begun, only when the court makes the necessity and good-cause finding, and then only to let the smaller panel return a verdict. That structure separates this clause from the previous one. The smaller-jury option authorizes a panel of fewer than twelve without regard to why, while this option is tied to a single event, the excusal of a juror for good cause during trial. The constitutional floor of six from earlier remains a separate limit, since the clause names no particular number. The next subsection takes up Rule 23(b)(3), which operates after the jury has retired to deliberate and does not depend on a stipulation.
On an exam stem, the common error is to treat a stipulation alone as enough. The stipulation is half of the requirement, and the other half is the court's finding that excusing the juror is necessary for good cause, so a stem that reports an agreement without a finding, or a finding of mere convenience, has not satisfied the clause. The opposite error is to apply this clause to every smaller jury. A stipulation signed before trial for a jury of ten belongs to Rule 23(b)(2)(A), while a juror lost mid-trial with no stipulation in place cannot rely on this clause at all, and the question becomes whether the court-ordered option for eleven jurors is available.
Court-Ordered Jury of Eleven
The two stipulation options in Rule 23(b)(2) both depend on the parties' agreement, and Rule 23(b)(3) supplies a third route that does not. After the jury has retired to deliberate, the court may permit a jury of 11 persons to return a verdict, even without a stipulation by the parties, if the court finds good cause to excuse a juror.35 Three features define this court-ordered jury of eleven. The timing is fixed at the moment the jury has retired to deliberate, the number is eleven, and the authority comes from the court's own finding instead of anyone's consent. Each feature marks a difference from the clauses just covered, which run on written agreement and, in the case of stipulated excusal, apply at any point after the trial begins.
The reason for the rule lies in what a lost juror costs once deliberations are underway. By the time the jury retires, the trial is finished except for the jurors' own work: they have heard all of the evidence and have begun testing their views against one another. If the loss of a single juror at that stage meant starting over, everything the jury had accomplished, and the trial that preceded it, could be wasted. Rule 23(b)(3) lets the court preserve that work by accepting a verdict from the eleven who remain.
The rule's omission of any stipulation requirement does subtler work. A juror's departure during deliberations cannot be foreseen, and by then each side has some sense of how the jury is leaning. A party that believed the jury was leaning against it would have a motive to withhold agreement to an eleven-person verdict and force a new trial, so a rule that required consent would give either side a veto at the moment the veto is most valuable. Placing the decision with the court removes that veto. The safeguard runs in the other direction: the judge, who has no stake in the outcome, must find good cause to excuse the juror, and a party's preference for a particular panel does not supply it. The limit of eleven is built into the text as well. The clause authorizes a verdict from eleven persons and names no lower number, so a court that has lost two jurors finds no authority here, and the only route in Rule 23(b) to a smaller panel remains the written, court-approved stipulation.36
Two decisions show the provision's practical setting, and they answer different questions. In United States v. Brown, a trial judge let a case go to judgment with eleven jurors instead of seating an available alternate, after a five-day trial on a 14-count indictment in which the jury had already deliberated for more than a day and had asked five substantive questions; seating the alternate would have forced the jury to begin deliberating anew, and the Ninth Circuit upheld the choice as within the judge's discretion.37 Brown therefore shows the cost the rule is built to avoid and confirms that the court, not the parties, makes the call. United States v. Thomas addresses what counts as cause. A juror was dismissed during deliberations for refusing to apply the law as the court had instructed, and the court of appeals held that such a refusal violates the juror's oath and duty and so supports dismissal under Rule 23(b), with the remaining eleven returning the verdict.38
Placed beside the stipulated-excusal clause, the difference lies in what each requires. Rule 23(b)(2)(B) needs a written, court-approved agreement but can operate at any point after the trial begins, while Rule 23(b)(3) needs no agreement but operates only after deliberations have begun and only to produce a verdict from eleven.39 A juror lost after the jury retires can therefore be handled by either route when a stipulation exists, and the court-ordered route remains available when none does.
The first version of the scene satisfies every condition of the clause, and the second fails the timing condition alone, so the retirement of the jury is the fact that moved the answer.41 On an exam stem, the usual error is to apply this clause to a juror lost while evidence is still being heard, so the point at which the jury retires is the first thing to locate. A second error is to treat the clause as a general license for smaller panels, when it supports a verdict by eleven and nothing less. A third is to demand a stipulation, which this clause makes unnecessary.