9,884 people (2024 Census estimate, −14.8% since 2020)
421 square miles of land · 23 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.
9 active community water systems list DeKalb County in the area they serve, reporting 103,613 people served in all (a system that crosses county lines counts its whole population).
| MO AMERICAN ST JOSEPH groundwater · private · MO1010714 | 89,171 served |
| DEKALB COUNTY PWSD 1 buys groundwater · local government · MO1024191 | 7,635 served |
| CLINTON COUNTY PWSD 3 buys surface water · local government · MO1024155 | 3,722 served |
| MAYSVILLE PWS buys groundwater · local government · MO1010510 | 1,096 served |
| MO AMERICAN STEWARTSVILLE buys groundwater · private · MO1010762 | 928 served |
| OSBORN PWS buys groundwater · local government · MO1010609 | 405 served |
| UNION STAR PWS buys groundwater · local government · MO1010802 | 386 served |
| CLARKSDALE PWS buys groundwater · local government · MO1010167 | 245 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 68 people were held in DeKalb County's jail, in Vera's latest figure (2023), or 1,134 per 100,000 residents ages 15–64. In 2018 it was about 95.
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.
4 school districts have their office in DeKalb County. School taxes are usually the largest part of a property tax bill.
Spent $6.9 million — $6 million to run schools, about $11,202 per student, plus $807,000 on buildings and equipment. Money in: $4.2 million local (mostly property tax), $3 million state, $1 million federal. Long-term debt: $1.2 million.
Spent $3.4 million — $3 million to run schools, about $11,347 per student, plus $286,000 on buildings and equipment. Money in: $1.6 million local (mostly property tax), $1.7 million state, $208,000 federal. Long-term debt: $1.4 million.
Spent $3 million — $2.5 million to run schools, about $15,605 per student, plus $465,000 on buildings and equipment. Money in: $1.9 million local (mostly property tax), $1.1 million state, $229,000 federal.
Spent $2.4 million — $2.3 million to run schools, about $18,697 per student. Money in: $1.5 million local (mostly property tax), $1.1 million state, $194,000 federal. Long-term debt: $1.1 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 DeKalb County about $7.7 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively Moderate; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
238 bridges in DeKalb County: 78 in good condition, 144 fair, and 16 poor (6.7%). “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.
| SE FROST RD over WHEELER CR · built 1995 | 50 vehicles a day |
| WATER STREET over BR OF LOST CR · built 1933 | 50 vehicles a day |
| NW POLK RD over TRIB THIRD FK PLAT · built 1983 | 35 vehicles a day |
| NW GLENWOOD RD over 3RD FK OF PLATTE R · built 1989 | 35 vehicles a day |
| SE GRIDLEY RD over BR OF WHEELER CR · built 1930 | 35 vehicles a day |
| NE HEIMBAUGH RD over IRVINS BR · built 2002 | 25 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $9.6 million of work in DeKalb County in fiscal 2025, about $869 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 Missouri 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 DeKalb 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 DeKalb County built: brayden.ozark@gmail.com.
More of Missouri: the state government and every county in Missouri.
Nearby counties: Clinton County (20 mi) · Gentry County (22 mi) · Andrew County (22 mi) · Daviess County (24 mi) · Buchanan County (27 mi) · Caldwell County (28 mi).