The United States District Courts are the trial courts of the U.S. Federal Court system. Both criminal and civil trials are filed in District Courts. The juries of District Courts (the group of unbiased individuals assigned to decide on the case) are made up of regular citizens called for jury duty on a case-by-case basis. At some point in their lives, most adult U.S. citizens will be called for jury duty. There are 94 District Courts in America. District Courts are usually named for their geographic location such as "U.S. District Court - Western District of Pennsylvania."