Wyoming Counties by Population (2025)

There are 23 counties in Wyoming.

The most populous county in Wyoming is Laramie County, home to 98,976 residents. Laramie County accounts for 17.13% of Wyoming’s total population. Laramie County is also home to Cheyenne, the state capital.

The next-most populous counties in Wyoming include:

• Natrona County: 79,115 (comprising 13.69% of Wyoming’s population)
• Campbell County: 46,140 (comprising 7.99% of the state’s population)

Wyoming Counties with the Fewest Residents

Of Wyoming’s 23 counties, Niobrara County is the least populous with 2,388 residents. Niobrara’s population accounts for just 0.41% of the state’s total population. Following Niobrara County is:

• Hot Springs County: 4,555 residents
• Weston County: 6,967 residents

Other counties with populations below 10,000 include Crook, Washakie, Johnson, Platte, and Sublette counties.

Wyoming Counties with Rapid Growth

The Wyoming county with the highest population growth since the 2010 Census is Teton County which grew by 8.38%. This is followed by Lincoln County and Laramie County, which have grown by 7.38% and 7.31%, respectively.

While several counties have experienced population growth since 2010, others have experienced population decline. Washakie County experienced the most significant population decline of -7.56%, followed by Carbon County (-5.53%) and Hot Springs County (-5.32%).