Utah Code Ann. § 78A-7-106 – Jurisdiction.

(1) Justice courts have jurisdiction over class B and C misdemeanors, violation of ordinances, and infractions committed within their territorial jurisdiction by a person 18 years of age or older.
(2) Except those offenses over which the juvenile court has exclusive jurisdiction, justice courts have jurisdiction over the following class B and C misdemeanors, violation of ordinances, and infractions committed within their territorial jurisdiction by a person 16 years of age or older:
(3) Justice Courts have jurisdiction over class C misdemeanor violations of Title 53, Chapter 3, Part 2, Driver Licensing Act.
(4) As used in this section, "the court's jurisdiction" means the territorial jurisdiction of a justice court.
(5) An offense is committed within the territorial jurisdiction of a justice court if:
1. (a) conduct constituting an element of the offense or a result constituting an element of the offense occurs within the court's jurisdiction, regardless of whether the conduct or result is itself unlawful;
2. (b) either a person committing an offense or a victim of an offense is located within the court's jurisdiction at the time the offense is committed;
3. (c) either a cause of injury occurs within the court's jurisdiction or the injury occurs within the court's jurisdiction;
4. (d) a person commits any act constituting an element of an inchoate offense within the court's jurisdiction, including an agreement in a conspiracy;
5. (e) a person solicits, aids, or abets, or attempts to solicit, aid, or abet another person in the planning or commission of an offense within the court's jurisdiction;
6. (f) the investigation of the offense does not readily indicate in which court's jurisdiction the offense occurred, and:
  1. (i) the offense is committed upon or in any railroad car, vehicle, watercraft, or aircraft passing within the court's jurisdiction;
  2. (ii)
    1. (A) the offense is committed on or in any body of water bordering on or within this state if the territorial limits of the justice court are adjacent to the body of water; and
    2. (B) as used in Subsection (5)(f)(ii)(A), "body of water" includes any stream, river, lake, or reservoir, whether natural or man-made;
  3. (iii) a person who commits theft exercises control over the affected property within the court's jurisdiction; or
  4. (iv) the offense is committed on or near the boundary of the court's jurisdiction;
7. (g) the offense consists of an unlawful communication that was initiated or received within the court's jurisdiction; or
8. (h) jurisdiction is otherwise specifically provided by law.
(6) A justice court judge may transfer a criminal matter in which the defendant is a child to the juvenile court for further proceedings if the justice court judge determines and the juvenile court concurs that the best interests of the minor would be served by the continuing jurisdiction of the juvenile court.
(7) Justice courts have jurisdiction of small claims cases under Title 78A, Chapter 8, Small Claims Courts, if a defendant resides in or the debt arose within the territorial jurisdiction of the justice court.