How does South Carolina’s large Black population affect its politics?

South Carolina’s 27% Black population is the fourth-largest Black share of any state, concentrated in the Lowcountry, Pee Dee region, and Columbia metro. Black voters vote Democratic at roughly 85–90% and constitute about 28% of the Democratic primary electorate — making South Carolina’s early primary outsized national influence in Democratic presidential races. The Black Belt counties (Allendale, Bamberg, Orangeburg, Williamsburg) regularly produce D+60 margins. However, because Black voters are geographically concentrated, their statewide impact is limited by the overwhelming R margins in upstate white-majority counties. Rep. Jim Clyburn (D-SC-6), the Majority Whip who revived Joe Biden’s 2020 campaign with his endorsement, represents the Lowcountry Black-majority district and is the most powerful Black politician in the state.

What is the political difference between the Lowcountry and the Upstate?

South Carolina’s political geography divides sharply along a diagonal: the Lowcountry (Charleston, Beaufort, coastal counties) is wealthier, more diverse, and has a growing moderate Republican and independent base from retiree and transplant migration — Charleston County backed Biden in 2020. The Upstate (Greenville, Spartanburg, Anderson) is dominated by evangelical white conservatives who form the ideological heart of South Carolina’s Republican Party. Sen. Tim Scott and Sen. Lindsey Graham both hail from the Upstate tradition. Rural Midlands and Pee Dee counties are either overwhelmingly Black Democratic (Black Belt) or overwhelmingly white Republican (agricultural areas), with little competitive middle ground between them.

Is South Carolina becoming more competitive at the statewide level?

South Carolina was genuinely competitive through the 1990s: it elected Democratic governors and senators as recently as 1998. The shift to solid Republican territory accelerated in 2002–2010. But Charleston County’s leftward drift — driven by tech job growth, retirees from Northern states, and college-educated professionals — is beginning to close the gap in coastal races. Trump won South Carolina by 12 points in 2020 but the margin in congressional districts covering the Myrtle Beach and Hilton Head resort corridors has narrowed. A credible 2026 Senate challenger against Lindsey Graham (who faces re-election in 2026) would need to win Charleston County by 20+ points and run competitive margins in Richland County (Columbia) — a difficult but not impossible target.

Home › States › South Carolina › Demographics

Solid Republican

South Carolina Voter Demographics & Profile

A 27% Black population concentrated in the Lowcountry and Black Belt, a growing Charleston County swing states, and deep Upstate Republican roots — South Carolina’s divides are geographic as much as racial.

5.28M

Population

27%

Black / African American

67%

Urban Share

R+12

2020 Presidential

Racial & Ethnic Composition

Group	% Population	Est. Electorate Share	Political Lean
Non-Hispanic White	63%	66%	R+30 (Upstate); R+5 (Charleston)
Black / African American	27%	26%	D+75
Hispanic / Latino	6%	4%	D+15 (construction, agriculture workers)
Asian / Other	4%	4%	D+20 (Columbia, Charleston)

Age Distribution

Age Group	Share of Population	Est. Turnout Rate	Notes
18–29	17%	33%	Clemson, USC Columbia, HBCU campuses (SC State, Benedict)
30–44	20%	56%	Military families (Fort Jackson, Shaw AFB), suburban growth
45–64	27%	67%	Upstate evangelical core; Black Belt community pillars
65+	20%	74%	Growing retiree base; Myrtle Beach, Hilton Head migration from Northeast

Education Breakdown & Political Correlation

Education Level	Share of Adults	Political Lean	Key Areas
No college degree	62%	R+25 (white) / D+75 (Black)	Upstate manufacturing, Black Belt rural
Some college / Associate’s	21%	R+15	Greenville Technical, Trident Technical
Bachelor’s degree	17%	R+5	Charleston professionals, Columbia suburbanites
Graduate / Professional	12%	Even to D+10	USC, MUSC, Clemson faculty; lawyers, doctors

Urban / Suburban / Rural Split

Geography	Share of Vote	Key Areas	2020 Lean
Charleston County & coast	14%	Charleston, North Charleston, Hilton Head	D+3 (trending competitive)
Greenville / Upstate	20%	Greenville, Spartanburg, Anderson	R+35
Richland County (Columbia)	11%	Columbia, Forest Acres, Irmo	D+20 (University + Black voters)
Black Belt & Pee Dee Rural	55%	Orangeburg, Allendale, Florence, Horry	R+25 avg (D+50 Black counties offset by R+45 white rural)

2026 Electoral Implications

Senator Lindsey Graham faces re-election in 2026. Graham, who has survived primary challenges despite his occasionally antagonistic relationship with the MAGA base, will run in a state that is increasingly safe Republican but where Charleston County represents a slowly expanding Democratic opportunity. Graham won his last race in 2020 by 10 points despite national Democratic base and heavy fundraising by his opponent Jaime Harrison — a sign that South Carolina’s structural Republican advantage remains robust.

The state’s 7 congressional districts include two that are majority-Black (SC-6, Jim Clyburn’s district) and one that covers the increasingly competitive Charleston–Lowcountry corridor (SC-1). A post-2022 redistricting lawsuit that targeted the racially gerrymandered lines in SC-1 reached the Supreme Court in 2023 and produced a ruling requiring new district maps — the redrawn SC-1 map will directly affect competitive margins in 2026. Black voter turnout in Richland County (Columbia) and Orangeburg County will be the principal variable in any scenario where Democrats outperform their baseline statewide.

← Back to South Carolina · South Carolina Senate 2026 →