13,024 people (2024 Census estimate, −0.7% since 2020)
564 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.
7 active community water systems list Cass County in the area they serve, reporting 10,314 people served in all (a system that crosses county lines counts its whole population).
| ATLANTIC MUNICIPAL UTILITIES groundwater · local government · IA1509074 | 7,252 served |
| GRISWOLD WATER SUPPLY groundwater · local government · IA1528010 | 1,008 served |
| ANITA MUNICIPAL UTILITIES groundwater · local government · IA1503053 | 972 served |
| MASSENA WATER SUPPLY groundwater · local government · IA1558055 | 364 served |
| LEWIS WATER SUPPLY groundwater · local government · IA1535078 | 357 served |
| CUMBERLAND WATER SUPPLY groundwater · local government · IA1516093 | 266 served |
| WIOTA WATER WORKS groundwater · local government · IA1570032 | 95 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 7 people were held in Cass County's jail, in Vera's latest figure (2023), or 92 per 100,000 residents ages 15–64. In 2018 it was about 17.
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 Cass County. School taxes are usually the largest part of a property tax bill.
Spent $23 million — $19.5 million to run schools, about $12,155 per student, plus $2.9 million on buildings and equipment. Money in: $10.6 million local (mostly property tax), $12.6 million state, $2.7 million federal. Long-term debt: $7.7 million.
Spent $11.6 million — $10.7 million to run schools, about $7,413 per student, plus $344,000 on buildings and equipment. Money in: $14.8 million local (mostly property tax), $2.6 million state, $913,000 federal.
Spent $8.3 million — $6.2 million to run schools, about $14,392 per student, plus $781,000 on buildings and equipment. Money in: $4.7 million local (mostly property tax), $3.7 million state, $718,000 federal. Long-term debt: $9.8 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: Relatively Low compared with other U.S. counties. FEMA estimates natural hazards cost Cass County about $16.6 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Relatively High.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
296 bridges in Cass County: 80 in good condition, 112 fair, and 104 poor (35.1%). “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.
| FM - OLIVE over NISHNABOTNA RIVER · built 1961 | 1,524 vehicles a day |
| FM - 690TH over SEVENMILE CREEK · built 1971 | 468 vehicles a day |
| FM - 690TH over WATERWAY · built 1963 | 450 vehicles a day |
| FM - 690TH over WATERWAY · built 1970 | 450 vehicles a day |
| WASHINGTON ST over DRAINAGE TO CAMP CREEK · built 1983 | 405 vehicles a day |
| FM - LANSING over WATERWAY · built 1900 | 379 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $2.9 million of work in Cass County in fiscal 2025, about $223 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 Cass 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 Cass County built: brayden.ozark@gmail.com.
More of Iowa: the state government and every county in Iowa.
Nearby counties: Adair County (24 mi) · Audubon County (24 mi) · Montgomery County (24 mi) · Adams County (25 mi) · Shelby County (31 mi) · Pottawattamie County (32 mi).