Food vendors specifically, you’ll want to inquire with X Teton County Health Department
All vendors in Wyoming are responsible for collecting sales tax on sales of tangible personal property [W.S. 39-15-103 (a)(i)(A)] and services to same. This includes vendors who are only doing business here temporarily, such as during gun shows, craft sales, church bazaars, etc. Wyoming laws require all businesses and/or individuals to register with the Department of Revenue when conducting sales in the State. Please feel free to contact Dale Paulley with the Wyoming Department of Revenue at 307-266-3621.