4,335 people (2024 Census estimate, +0.8% since 2020)
623 square miles of land · 7 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.
4 active community water systems list Deuel County in the area they serve, reporting 11,938 people served in all (a system that crosses county lines counts its whole population).
| BROOKINGS-DEUEL RURAL WATER SYSTEM groundwater · private · SD4600430 | 6,200 served |
| SIOUX RURAL WATER SYSTEM groundwater · private · SD4600866 | 4,280 served |
| CLEAR LAKE buys groundwater · local government · SD4600092 | 1,218 served |
| GARY buys groundwater · local government · SD4600139 | 240 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 9 people were held in Deuel County's jail, in Vera's latest figure (2021), or 365 per 100,000 residents ages 15–64. In 2016 it was about 4.
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 Deuel County. School taxes are usually the largest part of a property tax bill.
Spent $13.9 million — $6.2 million to run schools, about $11,452 per student, plus $7.5 million on buildings and equipment. Money in: $5.1 million local (mostly property tax), $2.2 million state, $713,000 federal. Long-term debt: $9.5 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: Very Low compared with other U.S. counties. FEMA estimates natural hazards cost Deuel County about $5.5 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
72 bridges in Deuel County: 16 in good condition, 43 fair, and 13 poor (18.1%). “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.
| SD022 over CK · built 1959 | 1,559 vehicles a day |
| 188 STREET over CK · built 1930 | 381 vehicles a day |
| 188 STREET over HIDEWOOD CK · built 1978 | 90 vehicles a day |
| PARLE ST (GARY) over W BR LAC QUI PARLE RIVER · built 1950 | 50 vehicles a day |
| 2ND AVE (GARY) over W BR LAC QUI PARLE RIVER · built 1930 | 50 vehicles a day |
| TWNSHP RD 186TH ST over COBB CK · built 1950 | 45 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $21.2 million of work in Deuel County in fiscal 2025, about $4,930 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 Dakota 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 Deuel 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 Deuel County built: brayden.ozark@gmail.com.
More of South Dakota: the state government and every county in South Dakota.
Nearby counties: Hamlin County (24 mi) · Brookings County (27 mi) · Codington County (29 mi) · Grant County (29 mi) · Lac qui Parle County, MN (30 mi) · Lincoln County, MN (32 mi).