Grant County is a county in the U.S. state of Arkansas. Its population was 17,958 at the 2020 United States Census. The county seat is Sheridan.

Sheridan is a city and county seat of Grant County, Arkansas, United States. The community is located deep in the forests of the Arkansas Timberlands. It sits at the intersection of US Highways 167 and 270. Early settlers were drawn to the area by the native timber, which is still a very important part of Sheridan's economy, although the city has diversified into several other industries. Sheridan's history also includes a college, Missionary Baptist College, until its closure in 1934, and a series of conflicts during the Civil Rights Movement. Located at the southern end of the Central Arkansas region, Sheridan has been experiencing a population boom in recent years, as indicated by a 49% growth in population between the 1990 and 2010 censuses. The population as of the 2010 census was 4,603.