122,429 people (2024 Census estimate, +1.5% since 2020)
825 square miles of land · 148 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.
50 active community water systems list Allegan County in the area they serve, reporting 35,610 people served in all (a system that crosses county lines counts its whole population).
| ALLEGAN groundwater · local government · MI0000120 | 5,930 served |
| KALAMAZOO LAKE SEWER & WATER AUTHORITY groundwater · local government · MI0003525 | 5,000 served |
| WAYLAND groundwater · local government · MI0006940 | 4,435 served |
| OTSEGO groundwater · local government · MI0005060 | 4,120 served |
| PLAINWELL groundwater · local government · MI0005380 | 3,998 served |
| FENNVILLE groundwater · local government · MI0002260 | 2,438 served |
| LAKE DOSTER groundwater · local government · MI0002925 | 1,492 served |
| OTSEGO TOWNSHIP groundwater · local government · MI0005065 | 1,133 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 134 people were held in Allegan County's jail, in Vera's latest figure (2023), or 176 per 100,000 residents ages 15–64. In 2018 it was about 237.
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.
10 school districts have their office in Allegan County. School taxes are usually the largest part of a property tax bill.
Spent $41.9 million — $37.8 million to run schools, about $13,025 per student, plus $2.2 million on buildings and equipment. Money in: $12.9 million local (mostly property tax), $30.4 million state, $1.5 million federal. Long-term debt: $29.7 million.
Spent $43 million — $39.5 million to run schools, about $13,860 per student, plus $657,000 on buildings and equipment. Money in: $16.1 million local (mostly property tax), $30.4 million state, $3.3 million federal. Long-term debt: $54.5 million.
Spent $49.1 million — $34.6 million to run schools, about $13,191 per student, plus $11.2 million on buildings and equipment. Money in: $13 million local (mostly property tax), $28.4 million state, $3.7 million federal. Long-term debt: $43 million.
Spent $44.6 million — $32.6 million to run schools, about $13,794 per student, plus $9.6 million on buildings and equipment. Money in: $11.5 million local (mostly property tax), $26 million state, $3.3 million federal. Long-term debt: $64.9 million.
Spent $46.4 million — $31.9 million to run schools, about $14,496 per student, plus $12.6 million on buildings and equipment. Money in: $12.4 million local (mostly property tax), $23.7 million state, $5.2 million federal. Long-term debt: $38.1 million.
Spent $22.7 million — $20.6 million to run schools, about $13,939 per student, plus $1.4 million on buildings and equipment. Money in: $7 million local (mostly property tax), $16.7 million state, $1.5 million federal. Long-term debt: $22.3 million.
Spent $22.3 million — $19.3 million to run schools, about $15,472 per student, plus $1.5 million on buildings and equipment. Money in: $7.7 million local (mostly property tax), $12.2 million state, $3.2 million federal. Long-term debt: $37.1 million.
Spent $25.5 million — $12.2 million to run schools, about $15,257 per student, plus $11.4 million on buildings and equipment. Money in: $12.4 million local (mostly property tax), $3.1 million state, $800,000 federal. Long-term debt: $28.8 million.
And 2 more.
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 Allegan County about $32 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.
245 bridges in Allegan County: 60 in good condition, 144 fair, and 41 poor (16.7%). “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.
| US-131 SB over GRAND ELK RR · built 1960 | 27,941 vehicles a day |
| I-196 EB over CSX RR · built 1972 | 9,123 vehicles a day |
| M-40 M-89 over KALAMAZOO RIVER · built 1938 | 8,300 vehicles a day |
| 142ND AVE over RED RUN DRAIN · built 1973 | 8,204 vehicles a day |
| 18TH ST over RED RUN DRAIN · built 1970 | 7,600 vehicles a day |
| DIVISION STREET over RABBIT RIVER · built 1940 | 3,443 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $30.4 million of work in Allegan County in fiscal 2025, about $253 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 Michigan 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 Allegan 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 Allegan County built: brayden.ozark@gmail.com.
More of Michigan: the state government and every county in Michigan.
Nearby counties: Van Buren County (10 mi) · Cass County (37 mi) · Kalamazoo County (39 mi) · Ottawa County (44 mi) · Barry County (50 mi) · Berrien County (50 mi).