6,596 people (2024 Census estimate, +7.1% since 2020)
507 square miles of land · 13 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.
7 active community water systems list Hamlin County in the area they serve, reporting 9,470 people served in all (a system that crosses county lines counts its whole population).
| SIOUX RURAL WATER SYSTEM groundwater · private · SD4600866 | 4,280 served |
| CLARK RURAL WATER SYSTEM groundwater · private · SD4600881 | 2,325 served |
| ESTELLINE buys groundwater · local government · SD4600119 | 749 served |
| CASTLEWOOD buys groundwater · local government · SD4600002 | 698 served |
| LAKE NORDEN groundwater · local government · SD4600187 | 554 served |
| BRYANT buys groundwater · local government · SD4600076 | 471 served |
| HAYTI buys groundwater · local government · SD4600151 | 393 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 13 people were held in Hamlin County's jail, in Vera's latest figure (2021), or 365 per 100,000 residents ages 15–64. In 2016 it was about 6.
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.
3 school districts have their office in Hamlin County. School taxes are usually the largest part of a property tax bill.
Spent $8.9 million — $8.7 million to run schools, about $10,049 per student, plus $13,000 on buildings and equipment. Money in: $5.9 million local (mostly property tax), $3.5 million state, $1.1 million federal. Long-term debt: $6.2 million.
Spent $14.7 million — $3.9 million to run schools, about $11,611 per student, plus $10.8 million on buildings and equipment. Money in: $2.1 million local (mostly property tax), $1.9 million state, $345,000 federal. Long-term debt: $1.6 million.
Spent $4.4 million — $4.1 million to run schools, about $14,945 per student, plus $324,000 on buildings and equipment. Money in: $3.1 million local (mostly property tax), $928,000 state, $425,000 federal. Long-term debt: $4,000.
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 Hamlin County about $7 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.
61 bridges in Hamlin County: 26 in good condition, 28 fair, and 7 poor (11.5%). “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.
| 180TH STREET over BIG SIOUX RIVER · built 1930 | 135 vehicles a day |
| 192ND STREET over HIDEWOOD CREEK · built 1930 | 115 vehicles a day |
| 460TH AVENUE over LAKE POINSETT OUTLET · built 1960 | 66 vehicles a day |
| 190TH STREET over HIDEWOOD CREEK · built 1965 | 40 vehicles a day |
| 194TH STREET over DOLPH CREEK · built 1960 | 38 vehicles a day |
| 180TH STREET over TRIB. TO BIG SIOUX RIVER · built 1930 | 25 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $4 million of work in Hamlin County in fiscal 2025, about $648 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 Hamlin 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 Hamlin County built: brayden.ozark@gmail.com.
More of South Dakota: the state government and every county in South Dakota.
Nearby counties: Codington County (20 mi) · Deuel County (25 mi) · Kingsbury County (27 mi) · Brookings County (28 mi) · Clark County (29 mi) · Grant County (39 mi).