937,142 people (2024 Census estimate, +0.6% since 2020)
328 square miles of land · 2,858 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.
48 active community water systems list DuPage County in the area they serve, reporting 847,832 people served in all (a system that crosses county lines counts its whole population).
| NAPERVILLE buys surface water · local government · IL0434670 | 156,406 served |
| WHEATON buys surface water · local government · IL0431050 | 53,970 served |
| DOWNERS GROVE buys surface water · local government · IL0430300 | 49,425 served |
| ELMHURST buys surface water · local government · IL0430350 | 45,000 served |
| LOMBARD buys surface water · local government · IL0430600 | 44,476 served |
| CAROL STREAM buys surface water · local government · IL0430200 | 39,854 served |
| ADDISON buys surface water · local government · IL0430050 | 38,017 served |
| WOODRIDGE buys surface water · local government · IL0431250 | 33,566 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 486 people were held in DuPage County's jail, in Vera's latest figure (2022), or 82 per 100,000 residents ages 15–64. In 2017 it was about 632.
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.
42 school districts have their office in DuPage County. School taxes are usually the largest part of a property tax bill.
Spent $513.9 million — $472.8 million to run schools, about $18,408 per student, plus $33.6 million on buildings and equipment. Money in: $354.6 million local (mostly property tax), $173.5 million state, $19.7 million federal. Long-term debt: $107.1 million.
Spent $385.7 million — $364.2 million to run schools, about $22,661 per student, plus $19.3 million on buildings and equipment. Money in: $278.3 million local (mostly property tax), $112.2 million state, $13.9 million federal. Long-term debt: $9.4 million.
Spent $248 million — $230.7 million to run schools, about $19,827 per student, plus $11.6 million on buildings and equipment. Money in: $180.5 million local (mostly property tax), $80.4 million state, $14.1 million federal. Long-term debt: $76.8 million.
Spent $254.7 million — $182 million to run schools, about $21,926 per student, plus $64.6 million on buildings and equipment. Money in: $145.7 million local (mostly property tax), $54.1 million state, $4 million federal. Long-term debt: $196.3 million.
Spent $219.2 million — $189.7 million to run schools, about $24,208 per student, plus $24.9 million on buildings and equipment. Money in: $152 million local (mostly property tax), $63.3 million state, $9.2 million federal. Long-term debt: $50 million.
Spent $110.1 million — $98.5 million to run schools, about $20,037 per student, plus $4.8 million on buildings and equipment. Money in: $77.1 million local (mostly property tax), $30.2 million state, $2 million federal. Long-term debt: $11.5 million.
Spent $139.5 million — $125.8 million to run schools, about $26,354 per student, plus $6.2 million on buildings and equipment. Money in: $105 million local (mostly property tax), $36.2 million state, $3.3 million federal. Long-term debt: $119.3 million.
Spent $99.5 million — $93.2 million to run schools, about $23,793 per student, plus $1.5 million on buildings and equipment. Money in: $74.8 million local (mostly property tax), $35.1 million state, $5.3 million federal. Long-term debt: $61.6 million.
And 34 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 High compared with other U.S. counties. FEMA estimates natural hazards cost DuPage County about $366 million a year on average in buildings, crops and lives. Ability to bounce back (community resilience): Relatively High; social vulnerability: Very Low.
Source: FEMA National Risk Index (December 2025), expected annual loss. Ratings compare counties nationwide; they're estimates, not predictions.
345 bridges in DuPage County: 124 in good condition, 195 fair, and 26 poor (7.5%). “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.
| IL 38 over WINFIELD CREEK · built 1982 | 25,000 vehicles a day |
| COUNTY FARM RD over W BRANCH DU PAGE RIV · built 1929 | 22,800 vehicles a day |
| WARRENVILLE RD over E.BRANCH DU PAGE RV · built 1946 | 19,200 vehicles a day |
| GENEVA ROAD over W.BRANCH DU PAGE RV. · built 1941 | 17,600 vehicles a day |
| YORK ROAD over I-88 E-W Toll Ramp · built 1958 | 15,400 vehicles a day |
| CASS AVE over I- 55 · built 1960 | 14,000 vehicles a day |
Source: Federal Highway Administration, National Bridge Inventory (2025 submission). Includes state, county and city bridges.
Federal grants paid for $118.8 million of work in DuPage County in fiscal 2025, about $127 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 DuPage 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 DuPage County built: brayden.ozark@gmail.com.
More of Illinois: the state government and every county in Illinois.
Nearby counties: Kane County (19 mi) · Cook County (23 mi) · Kendall County (25 mi) · Lake County (27 mi) · Will County (28 mi) · DeKalb County (35 mi).