Wyo. Stat. § 2-1-208: Venue generally.

(a) An application for a decree under W.S. 2-1-205 shall be filed as follows:

(i) If the decedent was a resident of Wyoming at the time of his death, in the county of which the decedent was a resident;

(ii) If the decedent was not a resident of Wyoming at the time of his death, in a county in which any part of the estate is located.