11,719 people (2024 Census estimate, −2.2% since 2020)
504 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.
6 active community water systems list Chickasaw County in the area they serve, reporting 6,891 people served in all (a system that crosses county lines counts its whole population).
| NEW HAMPTON WATER SUPPLY groundwater · local government · IA1970051 | 3,494 served |
| NASHUA WATER SUPPLY groundwater · local government · IA1967041 | 1,551 served |
| FREDERICKSBURG WATER SUPPLY groundwater · local government · IA1940068 | 987 served |
| LAWLER WATER SUPPLY groundwater · local government · IA1957064 | 406 served |
| ALTA VISTA WATER DEPARTMENT groundwater · local government · IA1903027 | 227 served |
| IONIA WATER SUPPLY groundwater · local government · IA1946078 | 226 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 6 people were held in Chickasaw County's jail, in Vera's latest figure (2019), or 84 per 100,000 residents ages 15–64. In 2014 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.
2 school districts have their office in Chickasaw County. School taxes are usually the largest part of a property tax bill.
Spent $15 million — $13.3 million to run schools, about $12,781 per student, plus $761,000 on buildings and equipment. Money in: $8.4 million local (mostly property tax), $6.9 million state, $1.2 million federal. Long-term debt: $17.3 million.
Spent $9.1 million — $7.8 million to run schools, about $13,479 per student, plus $649,000 on buildings and equipment. Money in: $3.8 million local (mostly property tax), $5.1 million state, $688,000 federal. Long-term debt: $2 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 Chickasaw County about $10.9 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.
304 bridges in Chickasaw County: 126 in good condition, 98 fair, and 80 poor (26.3%). “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 RD over DRAINAGE DITCH · built 1953 | 2,642 vehicles a day |
| LOCAL RD over DRAINAGE DITCH · built 1954 | 2,396 vehicles a day |
| LOCAL RD over DRAINAGE DITCH · built 1927 | 1,051 vehicles a day |
| E HAMILTON ST over SMALL STREAM · built 1980 | 937 vehicles a day |
| FM over LITTLE WAPSIPINICON · built 1967 | 786 vehicles a day |
| US 218 over DRAINAGE DITCH · built 1959 | 639 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $3.4 million of work in Chickasaw County in fiscal 2025, about $283 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 Chickasaw 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 Chickasaw County built: brayden.ozark@gmail.com.
More of Iowa: the state government and every county in Iowa.
Nearby counties: Bremer County (19 mi) · Howard County (21 mi) · Floyd County (24 mi) · Fayette County (28 mi) · Winneshiek County (28 mi) · Mitchell County (31 mi).