Sebastian County, Arkansas
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Arkansas's location within the U.S.
|Founded||January 6, 1851|
|Named for||William K. Sebastian|
|Seat||Fort Smith (northern district);|
Greenwood (southern district)
|Largest city||Fort Smith|
|• Total||546 sq mi (1,410 km2)|
|• Land||532 sq mi (1,380 km2)|
|• Water||14 sq mi (40 km2) 2.6%%|
|• Density||236/sq mi (91/km2)|
|Time zone||UTC−6 (Central)|
|• Summer (DST)||UTC−5 (CDT)|
|Congressional districts||3rd, 4th|
Sebastian County is a county of the U.S. state of Arkansas. As of the 2010 census, the population was 125,744, making it the fourth-most populous county in Arkansas. The county has two county seats, Greenwood and Fort Smith.