What is the largest city in DuPage County, IL?

Naperville is the largest city or town in DuPage County, with about 150,692 residents.

How many ZIP codes are in DuPage County?

DuPage County includes 36 ZIP Code Tabulation Areas, including 60101, 60103, 60106, 60108, 60126.

What is the population of DuPage County, IL?

About 930,024 people live in DuPage County, based on American Community Survey 5-year estimates.

What counties border DuPage County?

DuPage County borders Cook County, Will County, Kane County, Kendall County.

DuPage County, IL: Cities, ZIP Codes & Local Data

Population

930,024

Land area

328sq mi

People per sq mi

2,837

ZIP codes

36

DuPage County at a glance

DuPage County is about 12 times as dense as Illinois as a whole.
It is the 2nd most populous of 102 counties in Illinois.
Households here earn a median of $112,096 a year, 34% more than the Illinois figure of $83,390.
A typical owner-occupied home is valued at $391,400 (49% above Illinois) and median rent is $1,688 a month.
The biggest population centers are Naperville (150,692), Wheaton (53,557) and Downers Grove (50,054).

Local data for DuPage County, IL

Counts from official public data

Housing and community stats

DuPage County, IL, American Community Survey 2020-2024

Full profile

Median household income

$112,096

Poverty rate

6.6%

Median home value

$391,400

Prices +6.2% in a year

Median rent

$1,688/mo

Homeownership

73.1%

Bachelor's or higher

51.8%

Median age

40.2

Average commute

27.7 min

Largest reported origins and ancestries: German Americans (149,515), Irish Americans (121,296), Mexican Americans (111,018).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

3.8%

Sep 2026, +0.3 pts in a year

Average annual pay

$81,891

629,392 jobs, 2025

Income per person

$98,481

BEA, 2024

Federal spending

$8.6B

FY 2026, $9,224 per person

PPP loans

$4.4B

43,069 loans, 438,491 jobs reported

Campaign donations

$13.1M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

DuPage County, IL, workers 16 and older. American Community Survey 5-year estimates

Drove alone64.9%
Carpooled6.8%
Public transit4.0%
Walked1.5%
Bicycle0.2%
Taxi, ride-hailing, motorcycle or other1.1%
Worked from home21.5%

Average one-way commute: 27.7 minutes for people who do not work from home.

Environment and hazard risk

DuPage County, IL, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively High

Top: cold wave

Storm events since 1996

1,204

Most often thunderstorm wind

Flood insurance policies

1,772

0.6% of homes, county

July high / Jan low

84° / 15°F

40.2 inches of rain a year

Hazards, floods and storm history Check a flood zone 34 historic places

Health statistics

Share of adults in DuPage County, IL, CDC PLACES estimates

All 40 measures

Obesity

29.2%

U.S. 33.3% -4.1 pts

Diabetes

10.0%

U.S. 12.1% -2.1 pts

Smoking

9.5%

U.S. 12.8% -3.3 pts

Uninsured (18-64)

7.2%

U.S. 11.1% -3.9 pts

Cities, towns and ZIP codes in DuPage County

Population shown

Frequently asked questions

What is the largest city in DuPage County, IL?: Naperville is the largest city or town in DuPage County, with about 150,692 residents.
How many ZIP codes are in DuPage County?: DuPage County includes 36 ZIP Code Tabulation Areas, including 60101, 60103, 60106, 60108, 60126.
What is the population of DuPage County, IL?: About 930,024 people live in DuPage County, based on American Community Survey 5-year estimates.
What counties border DuPage County?: DuPage County borders Cook County, Will County, Kane County, Kendall County.