104,776 people (2024 Census estimate, −0.7% since 2020)
665 square miles of land · 158 people per square mile
“Highest” and “lowest” are just order, not grades: a high rank for poverty or hazard losses means more of it. Each figure's source is in its section below.
18 active community water systems list Sumter County in the area they serve, reporting 87,763 people served in all (a system that crosses county lines counts its whole population).
| SUMTER CITY OF (SC4310001) groundwater · local government · SC4310001 | 53,070 served |
| HIGH HILLS groundwater · local government · SC4320003 | 12,545 served |
| SHAW AFB (SC4310501) groundwater · federal · SC4310501 | 9,000 served |
| DALZELL WATER DISTRICT (SC4320001) groundwater · local government · SC4320001 | 3,912 served |
| OSWEGO RURAL WATER CO (SC4320006) buys groundwater · private · SC4320006 | 3,282 served |
| SUMTER CO-WEDGEFIELD-STATEBURG WD groundwater · local government · SC4320002 | 1,200 served |
| BGWC OAKLAND PLANTATION (SC4350006) groundwater · private · SC4350006 | 1,180 served |
| MAYESVILLE TOWN OF (SC4310003) groundwater · local government · SC4310003 | 665 served |
Source: U.S. EPA Safe Drinking Water Information System (SDWIS), active community systems, . Look up any system's violations and test results with EPA's search using its ID.
About 276 people were held in Sumter County's jail, in Vera's latest figure (2023), or 424 per 100,000 residents ages 15–64. In 2018 it was about 197.
Source: Vera Institute of Justice, Incarceration Trends (built from federal Bureau of Justice Statistics jail surveys). Counties without their own jail, or that share one, may show no figure.
1 school district has its office in Sumter County. School taxes are usually the largest part of a property tax bill.
Spent $210.9 million — $189.4 million to run schools, about $12,795 per student, plus $18.1 million on buildings and equipment. Money in: $62.9 million local (mostly property tax), $124.9 million state, $43.2 million federal. Long-term debt: $72.8 million.
Source: U.S. Census Bureau, 2023 Annual Survey of School System Finances. Districts are listed by the county of their main office; some serve neighboring counties too.
Source: County Health Rankings & Roadmaps 2025 (University of Wisconsin Population Health Institute), which gathers federal data (CDC, Census, and others); measures cover different recent years. Blank lines aren't reported for small counties.
Overall risk: Relatively Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Sumter County about $40.7 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Relatively Moderate.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
166 bridges in Sumter County: 67 in good condition, 82 fair, and 17 poor (10.2%). “Poor” means a main part — the deck, the beams, or the supports — is rated 4 or lower on the federal 0–9 scale. It doesn't mean unsafe to drive; unsafe bridges are closed.
| I-95 over HOPE SWAMP · built 1967 | 33,200 vehicles a day |
| US 76 over U.S. 15 · built 1957 | 15,800 vehicles a day |
| US 76 over U.S. 76 BUSINESS · built 1958 | 14,300 vehicles a day |
| US 15 SB over POCOTALIGO RIVER · built 1935 | 10,600 vehicles a day |
| S-43-55 over SHOT POUCH BRANCH · built 1960 | 9,900 vehicles a day |
| S-43-152 over RR CSXT & DIVINE STREET · built 1940 | 5,100 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $27.9 million of work in Sumter County in fiscal 2025, about $265 per resident — to the county, cities, schools, hospitals, nonprofits and others.
Source: USAspending.gov, grants by place of performance, fiscal 2025 (Oct. 2024 to Sept. 2025). Search it by county to see each award.
From Grants.gov: posted grants listing county governments as eligible, soonest deadline first; research-only and overseas programs left out; list updated 2026-10-13, refreshed weekly. 62 are open in all. Cities, towns, school districts and nonprofits have their own lists there.
Registration deadlines, early voting and polling places for South Carolina are on the federal site vote.gov, which links to the state's official election office.
The budget, property tax rates, audits, local officials and offices for Sumter County come from the county's own records, which we haven't gathered — not gathered, never hidden. See what a full county site looks like, or ask to have Sumter County built: brayden.ozark@gmail.com.
More of South Carolina: the state government and every county in South Carolina.
Nearby counties: Lee County (18 mi) · Clarendon County (20 mi) · Calhoun County (28 mi) · Richland County (31 mi) · Kershaw County (31 mi) · Darlington County (37 mi).