9,617 people (2024 Census estimate, +0.2% since 2020)
434 square miles of land · 22 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.
8 active community water systems list Humboldt County in the area they serve, reporting 6,820 people served in all (a system that crosses county lines counts its whole population).
| HUMBOLDT MUNICIPAL WATER DEPT groundwater (surface-influenced) · local government · IA4641064 | 4,792 served |
| DAKOTA CITY WATER SUPPLY groundwater · local government · IA4622095 | 769 served |
| LIVERMORE WATER SUPPLY groundwater · local government · IA4647090 | 383 served |
| BODE MUNICIPAL WATER SUPPLY groundwater · local government · IA4609028 | 304 served |
| RENWICK MUNIC WATER SUPPLY groundwater · local government · IA4669080 | 234 served |
| THOR WATER WORKS groundwater · local government · IA4680018 | 181 served |
| RUTLAND WATER SUPPLY groundwater · local government · IA4675012 | 116 served |
| OTTOSEN WATER SUPPLY groundwater · local government · IA4652011 | 41 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 4 people were held in Humboldt County's jail, in Vera's latest figure (2019), or 70 per 100,000 residents ages 15–64. In 2014 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.
3 school districts have their office in Humboldt County. School taxes are usually the largest part of a property tax bill.
Spent $24.1 million — $18 million to run schools, about $11,884 per student, plus $5 million on buildings and equipment. Money in: $10.9 million local (mostly property tax), $10.6 million state, $1.6 million federal. Long-term debt: $5.5 million.
Spent $3.5 million — $2 million to run schools, about $16,597 per student, plus $325,000 on buildings and equipment. Money in: $2.5 million local (mostly property tax), $1.4 million state, $414,000 federal. Long-term debt: $26,000.
Spent $3 million — $1.7 million to run schools, about $35,082 per student, plus $171,000 on buildings and equipment. Money in: $1.8 million local (mostly property tax), $1.1 million state, $419,000 federal.
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 Humboldt County about $9.7 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.
87 bridges in Humboldt County: 34 in good condition, 46 fair, and 7 poor (8.0%). “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.
| LOCAL over DM RIVER · built 1911 | 60 vehicles a day |
| 215TH ST over DES MOINES RIVER · built 1899 | 50 vehicles a day |
| FM over DM RIVER · built 1905 | 30 vehicles a day |
| LOCAL over DRAINAGE DITCH · built 1948 | 15 vehicles a day |
| LOCAL over PRAIRIE CREEK · built 1900 | 15 vehicles a day |
| LOCAL over DM RIVER · built 1924 | 11 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $3.3 million of work in Humboldt County in fiscal 2025, about $347 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 Humboldt 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 Humboldt County built: brayden.ozark@gmail.com.
More of Iowa: the state government and every county in Iowa.
Nearby counties: Wright County (24 mi) · Webster County (24 mi) · Pocahontas County (24 mi) · Kossuth County (30 mi) · Hancock County (31 mi) · Palo Alto County (31 mi).