- Lead
- 19,803
- Total
- 66,767
- vs nation
- R+28.2
South Carolina 18th State Senate District
President margin by year
Place winner margin
President results by year
Modeled candidate-vote estimate on current district boundaries
- Lead
- 16,454
- Total
- 65,470
- vs nation
- R+29.6
- Lead
- 16,962
- Total
- 55,401
- vs nation
- R+32.7
- Lead
- 15,452
- Total
- 52,312
- vs nation
- R+33.4
- Lead
- 16,746
- Total
- 52,860
- vs nation
- R+39.0
- Lead
- 18,108
- Total
- 44,130
- vs nation
- R+38.6
- Lead
- 16,234
- Total
- 40,563
- vs nation
- R+40.5
- Lead
- 9,811
- Total
- 33,183
- vs nation
- R+38.1
Key facts
- 2024 presidential margin
- R+29.7MIT Election Lab
- Population
- 115,3302024 5-year
- Population density
- 154 / sq mi2024 5-year · TIGER/Line
- Land area
- 749 sq miTIGER/Line
- Median household income
- $84,8962024 5-year
- White (non-Hispanic)
- 70.6%2024 5-year
- Black
- 17.5%2024 5-year
- Hispanic / Latino
- 5.6%2024 5-year
- Peak Democratic margin
- D+96.6 in 1932MIT Election Lab
- Peak Republican margin
- R+66.5 in 1972MIT Election Lab
- Most similar
- State Senate District 24, GA · twin score 95.0
presidential history
Party record book
South Carolina 18th State Senate District · the strongest Democratic and Republican presidential performances recorded here, measured three ways.
1892–2024 (partial returns from 1876) · 38 presidential cycles · 38 with a vote-share denominator · 34 with a national benchmark
Highest vote share
Largest share of the presidential candidate vote cast here.
Democratic
Franklin D. Roosevelt1932
98.2%
3,375 votes · D+96.6 · modeled estimate
Runner-up · Franklin D. Roosevelt, 1936 · 98.0%
Republican
Richard Nixon1972
82.4%
19,745 votes · R+66.5 · modeled estimate
Runner-up · Ronald Reagan, 1984 · 76.1%
Most votes
Largest number of votes cast for the party’s presidential nominee here.
Democratic
Joe Biden2020
23,982votes
36.6% of the vote · R+25.1 · modeled estimate
Runner-up · Kamala Harris, 2024 · 23,005 votes
Republican
Donald Trump2024
42,808votes
64.1% of the vote · R+29.7 · modeled estimate
Runner-up · Donald Trump, 2020 · 40,436 votes
Best relative to the U.S.
This Place’s margin against the national margin in the same election — positive when it leaned toward the party more than the country did.
Democratic
John W. Davis1924
+119.7pts D vs U.S.
Place D+94.5 · U.S. R+25.2 · modeled estimate
Runner-up · James M. Cox, 1920 · +115.9 pts
Republican
Barry Goldwater1964
+68.0pts R vs U.S.
Place R+45.4 · U.S. D+22.6 · modeled estimate
Runner-up · Richard Nixon, 1972 · +43.4 pts
Current officeholders
State legislative officeholder from OpenStates nightly current-legislator data.
Senate and governor results are in the Office selector at the top of this page.
U.S. House
Each row is a county-allocated estimate of U.S. House votes for this district — county returns apportioned onto its boundary, not precinct-counted. “Vote lead” is the estimated local lead here, not necessarily the winner of the full contest.
With a 29.7-point Republican presidential margin in 2024, this district ranks among the state's most reliably one-sided constituencies, reflecting a rural and small-town demographic profile common to South Carolina's interior.
Across the recorded series it reached a Democratic high of 96.6 points in 1932 and a Republican high of 66.5 points in 1972. Between 2020 and 2024 the district moved 4.5 points toward the Republican candidate; the 2024 margin was 29.7 points.
A population of 115,330, a 71% non-Hispanic-white share, and a median household income of $84,896 describe the district. The district's voting pattern over the last decade is most similar to that of State Senate District 24 and State Senate District 11.
The state-senate districts whose fingerprint — 2000–2024 trajectory, demographics, ancestry, religion — sits closest to this one, and why.
Twin score (0–100) = weighted cosine between tier-standardized fingerprints: presidential margins 2000–2024 with 12-yr trend and elasticity, ACS income, age, education, population and race, top reported ancestries, and religious adherence — chips name the closest-shared dimensions and the widest gap. Re-weight the groups in the twins explorer.
District research tools
Open the source-auditable district brief for electoral baseline, electorate, current-cycle coverage, geography, official dates, and methodology. Open campaign intelligence report → · Browse all comparisons →
South Carolina 18th State Senate District. Akashic. https://akashic.app/sld-upper/45018/. Accessed May 20, 2026. License: CC BY 4.0.