Wyo. Stat. § 1-11-119: Number of jurors; fees and mileage.

Trial juries in circuit courts shall be composed of six (6) persons. Trial juries in civil cases and all other proceedings in the district courts except criminal cases shall be composed of six (6) jurors unless one (1) of the parties to the action files a written demand for twelve (12) jurors within the time a demand for jury may be filed, in which event the number of jurors shall be twelve (12). Jurors in all courts shall be allowed the same fees and mileage as jurors in district court.