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Sebastian County Arkansas ☎ +1 479-783-6139 Last Updated: 06/25/2025 |
| Sebastian County is a county located in the U.S. state of Arkansas. As of the 2020 census, the population was 127,799. The county has two county seats, Greenwood and Fort Smith. The Arkansas River forms the county’s northern border, while its southern border touches upon the Ouachita Mountains. | |
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