The Lowcountry Council of Governments has prepared a report that provides a summary of 2020 Census data of Beaufort, Hampton,  Colleton, and Jasper Counties. Additionally, there is a summary of 2000-2020 Census population of counties and municipalities with a population of 5,000 or more. 

Data obtained is from the U.S. Census Bureau.  

2020 Census Demographic Data (PDF)
2000-2020 Census Population (PDF)