107,257 people (2024 Census estimate, +1.2% since 2020)
873 square miles of land · 123 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.
17 active community water systems list Woodbury County in the area they serve, reporting 97,929 people served in all (a system that crosses county lines counts its whole population).
| SIOUX CITY WATER SUPPLY groundwater (surface-influenced) · local government · IA9778054 | 85,791 served |
| SERGEANT BLUFF WATER SUPPLY groundwater · local government · IA9774033 | 5,015 served |
| MOVILLE WATER SUPPLY groundwater · local government · IA9753022 | 1,687 served |
| SLOAN WATER SUPPLY groundwater · local government · IA9780059 | 1,042 served |
| LAWTON WATER SUPPLY groundwater · local government · IA9743065 | 988 served |
| CORRECTIONVILLE WATER SUPPLY groundwater · local government · IA9721076 | 766 served |
| ANTHON MUNICIPAL WATER SYSTEM groundwater · local government · IA9704060 | 545 served |
| PIERSON WATER SUPPLY groundwater · local government · IA9766041 | 345 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 190 people were held in Woodbury County's jail, in Vera's latest figure (2023), or 283 per 100,000 residents ages 15–64. In 2018 it was about 218.
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.
6 school districts have their office in Woodbury County. School taxes are usually the largest part of a property tax bill.
Spent $211.4 million — $193.1 million to run schools, about $12,880 per student, plus $10.3 million on buildings and equipment. Money in: $49.6 million local (mostly property tax), $155.4 million state, $41.2 million federal. Long-term debt: $93.5 million.
Spent $24.4 million — $21.8 million to run schools, about $12,621 per student, plus $1.3 million on buildings and equipment. Money in: $12.5 million local (mostly property tax), $11.4 million state, $1.2 million federal.
Spent $9.7 million — $8.2 million to run schools, about $11,483 per student, plus $824,000 on buildings and equipment. Money in: $6.3 million local (mostly property tax), $5.3 million state, $487,000 federal. Long-term debt: $1.6 million.
Spent $10.1 million — $8.1 million to run schools, about $12,930 per student, plus $1.6 million on buildings and equipment. Money in: $5.5 million local (mostly property tax), $3.6 million state, $725,000 federal.
Spent $9 million — $8 million to run schools, about $14,196 per student, plus $528,000 on buildings and equipment. Money in: $4.2 million local (mostly property tax), $4.7 million state, $715,000 federal. Long-term debt: $2.1 million.
Spent $6.7 million — $5.3 million to run schools, about $15,605 per student, plus $456,000 on buildings and equipment. Money in: $3.8 million local (mostly property tax), $2.9 million state, $534,000 federal. Long-term debt: $990,000.
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: Relatively Moderate compared with other U.S. counties. FEMA estimates natural hazards cost Woodbury County about $50.7 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
455 bridges in Woodbury County: 178 in good condition, 182 fair, and 95 poor (20.9%). “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.
| IA 12 over BNSF RVR STS & IA 376 · built 1936 | 20,600 vehicles a day |
| 6TH ST over FLOYD RIVER · built 1962 | 8,957 vehicles a day |
| 4TH ST. over OVER RR · built 1984 | 6,031 vehicles a day |
| DACE AVE over FLOYD RIVER · built 1962 | 4,432 vehicles a day |
| 11TH ST over FLOYD RIVER · built 1962 | 3,523 vehicles a day |
| IA 141 over I-29 · built 1959 | 2,980 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $65.2 million of work in Woodbury County in fiscal 2025, about $616 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 Iowa 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 Woodbury 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 Woodbury County built: brayden.ozark@gmail.com.
More of Iowa: the state government and every county in Iowa.
Nearby counties: Monona County (24 mi) · Plymouth County (25 mi) · Dakota County, NE (26 mi) · Ida County (28 mi) · Thurston County, NE (30 mi) · Cherokee County (32 mi).