Wallace County is a county located in the U.S. state of Kansas. Its county seat is Sharon Springs. As of the 2020 census, the county population was 1,512, making it the second-least populous county in Kansas. The county was created in 1868 and named in honor of Brigadier General W.H.L. Wallace, who had been mortally wounded in combat in the Battle of Shiloh. Wallace County is home to Mount Sunflower, the highest point in Kansas at 4,039 feet. Mount Sunflower is located approximately 15 miles (24 km) north-northwest of Weskan, less than one mile (1.6 km) from the Colorado state line. It is one of four Kansas counties to use the Mountain Time Zone rather than the Central Time Zone like the remainder of Kansas.

Kansas is a landlocked state in the Midwestern region of the United States. It borders Nebraska to the north; Missouri to the east; Oklahoma to the south; and Colorado to the west. Kansas is named after the Kansas River, in turn named after the Kansa people. Its capital is Topeka, and its most populous city is Wichita, however the largest urban area is the bi-state Kansas City, MO–KS metropolitan area.