Sebastian County is a county located in the U.S. state of Arkansas. As of the 2020 census, the population was 127,799, making it the fourth-most populous county in Arkansas. The county has two county seats, Greenwood and Fort Smith.
Country: United States
State: Arkansas
Founded: January 6, 1851
Named for: William K. Sebastian
Seat: Fort Smith (northern district); · Greenwood (southern district)
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