12,425 people (2024 Census estimate, −0.9% since 2020)
500 square miles of land · 25 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.
14 active community water systems list Allen County in the area they serve, reporting 9,991 people served in all (a system that crosses county lines counts its whole population).
| IOLA, CITY OF surface water · local government · KS2000103 | 5,343 served |
| HUMBOLDT, CITY OF surface water · local government · KS2000111 | 1,836 served |
| ALLEN CO RWD 8 buys surface water · local government · KS2000110 | 736 served |
| GAS CITY, CITY OF buys surface water · local government · KS2000102 | 501 served |
| LA HARPE, CITY OF buys surface water · local government · KS2000105 | 484 served |
| MORAN, CITY OF buys surface water · local government · KS2000116 | 467 served |
| ALLEN CO RWD 15 buys surface water · local government · KS2000121 | 135 served |
| ALLEN CO RWD 16 buys surface water · local government · KS2000122 | 133 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 47 people were held in Allen County's jail, in Vera's latest figure (2019), or 608 per 100,000 residents ages 15–64. In 2014 it was about 44.
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 Allen County. School taxes are usually the largest part of a property tax bill.
Spent $24 million — $17.7 million to run schools, about $14,692 per student, plus $5 million on buildings and equipment. Money in: $4.4 million local (mostly property tax), $14.1 million state, $2.2 million federal. Long-term debt: $34.1 million.
Spent $12.7 million — $10.5 million to run schools, about $10,798 per student, plus $1.7 million on buildings and equipment. Money in: $2.6 million local (mostly property tax), $9.8 million state, $1.1 million federal.
Spent $5.4 million — $4.9 million to run schools, about $17,822 per student, plus $519,000 on buildings and equipment. Money in: $1.5 million local (mostly property tax), $3 million state, $772,000 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 Allen County about $7.7 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.
227 bridges in Allen County: 103 in good condition, 99 fair, and 25 poor (11.0%). “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.
| RS 4 over BRANCH OF DEER CREEK · built 1935 | 300 vehicles a day |
| WALNUT STREET over COON CREEK · built 1930 | 250 vehicles a day |
| SYCAMORE STREET over COON CREEK · built 1930 | 150 vehicles a day |
| BUCKEYE STREET over COON CREEK · built 1910 | 150 vehicles a day |
| RS 1132 over TRIB. TO NEOSHO RIVER · built 1930 | 106 vehicles a day |
| RS 1151 over BIG CREEK · built 1930 | 99 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $5.6 million of work in Allen County in fiscal 2025, about $449 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 Kansas 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 Allen 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 Allen County built: brayden.ozark@gmail.com.
More of Kansas: the state government and every county in Kansas.
Nearby counties: Neosho County (22 mi) · Anderson County (23 mi) · Bourbon County (25 mi) · Woodson County (25 mi) · Wilson County (33 mi) · Coffey County (34 mi).