Utah Code § 78B-3a-206
§ 78B-3a-206. Transitory actions.
(1) Except for a transitory action under Subsection (2), a plaintiff shall bring a transitory action arising outside the state in the county where the defendant resides if the action is brought in this state. (2) A plaintiff shall bring a transitory action arising outside the state in favor of residents of this state in the county where: (a) the plaintiff resides; or (b) the principal defendant resides.