Juries range in size according to their nature. Grand juries are so named because they are usually larger than petit juries, having from 12 to 23 members. Traditionally, petit juries have had 23 members, but the number is not fixed. In 1970, the U.S. Supreme Court held that the number 12 was not an essential element of trial by jury (Williams v. Florida, 399 U.S. 78, 90 S. Ct. 1893, 26 L. Ed. 2d 446), and it has sanctioned juries of no fewer than six members in criminal cases (Ballew v. Georgia, 435 U.S. 223, 98 S. Ct. 1029, 55 L. Ed. 2d 234 ). Parties in federal district courts, as well as in many state courts, can stipulate that the jury size be any number between six and 12. Commonly, federal district court juries consist of six persons for civil cases.
Law Library - American Law and Legal InformationFree Legal Encyclopedia: Jokes to Robert Marion La FolletteJury - History, Minnesota's Approach To A More Diverse Jury Pool, Should The Peremptory Challenge Be Abolished?