|Allendale County South Carolina Cities/Towns - Allendale (County Seat), Fairfax, Millett, Sycamore, Ulmer
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Allendale County is a county located in the U.S. state of South Carolina. A 2016 estimate placed the population at 9,045. Its county seat is Allendale.
Allendale County is the location of the Topper Site, an archeological excavation providing possible evidence of a pre-Clovis culture dating back 50,000 years. The site is near a source of chert on private land in Martin owned by Clariant Corporation, a Swiss chemical company with a plant there. The site, named after John Topper, a local resident who discovered it, has been under excavation by archeologists from the University of South Carolina for about one month a year since 1999, after an initial exploratory dig in the mid-1980s.