10,630 people (2024 Census estimate, −1.8% since 2020)
402 square miles of land · 26 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 Louisa County in the area they serve, reporting 5,760 people served in all (a system that crosses county lines counts its whole population).
| WAPELLO MUNICIPAL WATER WORKS groundwater · local government · IA5879063 | 1,977 served |
| COLUMBUS JUNCTION WATER SUPPLY groundwater · local government · IA5815064 | 1,830 served |
| MORNING SUN WATER DEPARTMENT groundwater · local government · IA5857011 | 752 served |
| GRANDVIEW MUNI WATER DEPT groundwater · local government · IA5842000 | 437 served |
| COLUMBUS CITY PUBLIC WATER SUPPLY buys groundwater · local government · IA5809063 | 392 served |
| OAKVILLE WATER SUPPLY groundwater · local government · IA5868085 | 200 served |
| WOODLAND WAPELLO MOBILE HOME PARK groundwater · private · IA5879601 | 126 served |
| LOUISA CO LAW ENFORCEMENT CTR groundwater · local government · IA5800901 | 46 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 14 people were held in Louisa County's jail, in Vera's latest figure (2023), or 214 per 100,000 residents ages 15–64. In 2018 it was about 14.
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 Louisa County. School taxes are usually the largest part of a property tax bill.
Spent $11.8 million — $10.3 million to run schools, about $12,594 per student, plus $805,000 on buildings and equipment. Money in: $5.7 million local (mostly property tax), $6.1 million state, $1.1 million federal. Long-term debt: $5.3 million.
Spent $10.7 million — $9.2 million to run schools, about $13,780 per student, plus $613,000 on buildings and equipment. Money in: $4 million local (mostly property tax), $7.1 million state, $1.6 million federal. Long-term debt: $2.9 million.
Spent $9.2 million — $7.7 million to run schools, about $14,323 per student, plus $649,000 on buildings and equipment. Money in: $3.9 million local (mostly property tax), $4.7 million state, $1.1 million federal. Long-term debt: $3.2 million.
Spent $2.8 million — $1.8 million to run schools, about $14,702 per student, plus $96,000 on buildings and equipment. Money in: $1.6 million local (mostly property tax), $1.7 million state, $302,000 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 Louisa County about $8.4 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.
151 bridges in Louisa County: 48 in good condition, 81 fair, and 22 poor (14.6%). “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.
| LINN ST over INDIAN CREEK · built 1986 | 780 vehicles a day |
| FM over SMALL STREAM · built 1960 | 660 vehicles a day |
| FM over SM STREAM · built 1950 | 490 vehicles a day |
| FM over LONG CREEK · built 1963 | 250 vehicles a day |
| MANOR RD over DRAINAGE · built 1920 | 144 vehicles a day |
| FM over OTTER CR · built 1959 | 80 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $9.5 million of work in Louisa County in fiscal 2025, about $877 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 Louisa 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 Louisa County built: brayden.ozark@gmail.com.
More of Iowa: the state government and every county in Iowa.
Nearby counties: Muscatine County (20 mi) · Des Moines County (21 mi) · Henry County (22 mi) · Washington County (25 mi) · Mercer County, IL (27 mi) · Henderson County, IL (32 mi).