White Knoll is an unincorporated area and census-designated place (CDP) in Lexington County, South Carolina, United States. It was first listed as a CDP in the 2020 census with a population of 7,858.

The CDP is in central Lexington County, bordered to the north by Red Bank and 5 miles (8 km) south of Lexington, the county seat. South Carolina Highway 6 passes through the community, leading north to Lexington and southeast 15 miles (24 km) to Swansea.

White Knoll High School is in the northern part of the community on the south side of Platt Springs Road.

Historical population

Census	Pop.	Note	%±
2020	7,858		—
U.S. Decennial Census 2020

White Knoll CDP, South Carolina – Demographic Profile
(NH = Non-Hispanic)

Race / Ethnicity	Pop 2020	% 2020
White alone (NH)	5,084	64.70%
Black or African American alone (NH)	1,710	21.76%
Native American or Alaska Native alone (NH)	24	0.31%
Asian alone (NH)	108	1.37%
Pacific Islander alone (NH)	2	0.03%
Some Other Race alone (NH)	41	0.52%
Mixed Race/Multi-Racial (NH)	381	4.85%
Hispanic or Latino (any race)	508	6.46%
Total	7,858	100.00%

Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race.