Sublette County is located in western Wyoming, and it covers an area of approximately 4,936 square miles.

The area that is now Sublette County was once inhabited by several Native American tribes, including the Shoshone and the Arapaho. The first non-native explorers to visit the area were fur trappers and traders who arrived in the early 1800s.

In the mid-1800s, the area became a center for the fur trade, as well as the livestock and cattle industries. In 1869, the area saw a surge in population and economic growth with the arrival of the Union Pacific Railroad, which brought new settlers and supplies to the area.

During the late 1800s and early 1900s, Sublette County experienced a period of rapid growth and development, thanks to the discovery of oil and natural gas in the nearby fields. The towns of Pinedale, Big Piney, and Marbleton all grew rapidly during this time, becoming important centers for the oil and gas industry.

During World War II, Sublette County played a significant role in the war effort, with the nearby Pinedale Anticline serving as an important source of fuel for the U.S. military. The area also served as a training ground for the 10th Mountain Division of the U.S. Army.

Today, Sublette County remains an important center for the energy industry, with oil and gas exploration and production continuing to drive the local economy. The area is also a popular tourist destination, thanks to its stunning natural beauty and abundance of outdoor recreational opportunities, including fishing, hunting, hiking, and camping.