Barnwell is located in South Carolina. Barnwell, South Carolina 29812 has population of 4,602. Barnwell 29812 is less family-centric than the surrounding county with 21% of the households with children.
The median household income in Barnwell, South Carolina 29812 is $38,967. The median household income for the surrounding county is $38,763 compared to the national median of $66,222. The median age of people living in Barnwell 29812 is 38.4 years.
The average high temperature in July is 93.1 degrees, with an average low temperature in January of 35 degrees. The annual precipitation is 47.23.