How many counties are there in Wyoming? As of 2024, there are a total of 23 counties in the state of Wyoming. Among them, Laramie County is the oldest one (established in 1867) while Teton County is the youngest (established in 1921). With population of 94,483, Laramie County is the most populated. The biggest county by land area is Sweetwater County (27,003 km²) and the smallest is Hot Springs County (5,190 km²).
