Mississippi County is the easternmost county in the U.S. state of Arkansas. As of the 2020 census, the population was 40,685. There are two county seats, Blytheville and Osceola. The county was formed on November 1, 1833, and named for the Mississippi River which borders the county to the east. Mississippi County is part of the First Congressional District in Arkansas. The Blytheville, AR Micropolitan Statistical Area includes all of Mississippi County. According to the U.S. Census Bureau, the county has a total area of 920 square miles (2,400 km2), of which 901 square miles (2,330 km2) is land and 19 square miles (49 km2) (2.1%) is water. More information...
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