143,171 people (2024 Census estimate, +8.2% since 2020)
320 square miles of land · 447 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.
9 active community water systems list Kendall County in the area they serve, reporting 76,297 people served in all (a system that crosses county lines counts its whole population).
| OSWEGO groundwater · local government · IL0930150 | 38,169 served |
| YORKVILLE groundwater · local government · IL0930250 | 23,000 served |
| PLANO groundwater · local government · IL0930200 | 12,600 served |
| IL AMERICAN-VALLEY MARINA groundwater · private · IL0935100 | 1,102 served |
| NEWARK groundwater · local government · IL0930100 | 986 served |
| FOX LAWN HOMEOWNERS WATER ASSOCIATION groundwater · private · IL0935150 | 167 served |
| IL AMERICAN-HOLLIS groundwater · private · IL0935200 | 107 served |
| STORYBOOK HIGHLANDS groundwater · private · IL0935250 | 100 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 141 people were held in Kendall County's jail, in Vera's latest figure (2021), or 156 per 100,000 residents ages 15–64. In 2016 it was about 118.
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.
6 school districts have their office in Kendall County. School taxes are usually the largest part of a property tax bill.
Spent $310 million — $291.9 million to run schools, about $17,229 per student, plus $7.2 million on buildings and equipment. Money in: $164.9 million local (mostly property tax), $169.5 million state, $18.7 million federal. Long-term debt: $302.8 million.
Spent $112.9 million — $104.4 million to run schools, about $15,050 per student, plus $4.8 million on buildings and equipment. Money in: $79.6 million local (mostly property tax), $48.3 million state, $4.6 million federal. Long-term debt: $58.3 million.
Spent $47.5 million — $39 million to run schools, about $15,971 per student, plus $4 million on buildings and equipment. Money in: $20.6 million local (mostly property tax), $30.2 million state, $5.4 million federal. Long-term debt: $41 million.
Spent $4 million — $2.7 million to run schools, about $11,409 per student, plus $811,000 on buildings and equipment. Money in: $3 million local (mostly property tax), $746,000 state, $282,000 federal. Long-term debt: $1.3 million.
Spent $3.9 million — $3.5 million to run schools, about $20,386 per student, plus $179,000 on buildings and equipment. Money in: $3.6 million local (mostly property tax), $707,000 state, $139,000 federal. Long-term debt: $165,000.
Spent $1.7 million — $1.5 million to run schools, about $12,949 per student, plus $44,000 on buildings and equipment. Money in: $1.3 million local (mostly property tax), $724,000 state, $60,000 federal. Long-term debt: $339,000.
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 Kendall County about $74.8 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Very High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
131 bridges in Kendall County: 67 in good condition, 49 fair, and 15 poor (11.5%). “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.
| BASELINE RD/MS 199 over ROB ROY CREEK · built 1966 | 2,600 vehicles a day |
| CREEK RD over LITTLE ROCK CK · built 1995 | 2,300 vehicles a day |
| SCHAFER RD over ROB ROY CK · built 1978 | 1,400 vehicles a day |
| SCHLAPP RD over EAST AUX-SABLE CR · built 1967 | 1,200 vehicles a day |
| SCHLAPP RD/MS 360 over E.AUX SABLE CR. · built 1930 | 950 vehicles a day |
| WALKER RD over MIDDLE AUX SABLE · built 1965 | 825 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $15.8 million of work in Kendall County in fiscal 2025, about $120 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 Illinois 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 Kendall 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 Kendall County built: brayden.ozark@gmail.com.
More of Illinois: the state government and every county in Illinois.
Nearby counties: Grundy County (20 mi) · Kane County (24 mi) · Will County (25 mi) · DuPage County (25 mi) · DeKalb County (27 mi) · LaSalle County (29 mi).