What is the largest city in Will County, IL?

Joliet is the largest city or town in Will County, with about 150,445 residents.

How many ZIP codes are in Will County?

Will County includes 30 ZIP Code Tabulation Areas, including 60401, 60403, 60404, 60408, 60410.

What is the population of Will County, IL?

About 701,462 people live in Will County, based on American Community Survey 5-year estimates.

What counties border Will County?

Will County borders Cook County, DuPage County, Lake County, IN, Kendall County, Kankakee County, Grundy County.

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

Population

701,462

Land area

836sq mi

People per sq mi

839

ZIP codes

30

Will County at a glance

Will County is about 3.7 times as dense as Illinois as a whole.
It is the 4th most populous of 102 counties in Illinois.
Households here earn a median of $109,984 a year, 32% more than the Illinois figure of $83,390.
A typical owner-occupied home is valued at $319,600 (21% above Illinois) and median rent is $1,462 a month.
The biggest population centers are Joliet (150,445), Bolingbrook (74,096) and Plainfield (46,708).

Local data for Will County, IL

Counts from official public data

Housing and community stats

Will County, IL, American Community Survey 2020-2024

Full profile

Median household income

$109,984

Poverty rate

7.3%

Median home value

$319,600

Prices +4.6% in a year

Median rent

$1,462/mo

Homeownership

82.8%

Bachelor's or higher

37.5%

Median age

39.1

Average commute

31.4 min

Largest reported origins and ancestries: German Americans (115,509), Mexican Americans (115,121), Irish Americans (90,437).

Home values and rents Income, education and commute

Economy and federal money

Jobs, income, federal spending and pandemic loans

Details

Unemployment rate

5.1%

Aug 2026, +0.8 pts in a year

Average annual pay

$62,418

267,868 jobs, 2025

Income per person

$70,456

BEA, 2024

Federal spending

$3.92B

FY 2026, $5,636 per person

PPP loans

$1.51B

26,944 loans, 165,591 jobs reported

Campaign donations

$2.56M

Itemized, 2026 cycle

Economy Federal spending PPP loans

How people get to work

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

Drove alone72.9%
Carpooled8.0%
Public transit2.0%
Walked0.7%
Bicycle0.1%
Taxi, ride-hailing, motorcycle or other1.4%
Worked from home14.7%

Average one-way commute: 31.4 minutes for people who do not work from home.

Environment and hazard risk

Will County, IL, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively High

Top: cold wave

Storm events since 1996

1,341

Most often thunderstorm wind

Flood insurance policies

1,026

0.5% of homes, county

July high / Jan low

84° / 15°F

42.1 inches of rain a year

Hazards, floods and storm history Check a flood zone 23 historic places

Health statistics

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

All 40 measures

Obesity

38.0%

U.S. 33.3% +4.7 pts

Diabetes

10.7%

U.S. 12.1% -1.4 pts

Smoking

11.6%

U.S. 12.8% -1.2 pts

Uninsured (18-64)

9.1%

U.S. 11.1% -2.0 pts

Cities, towns and ZIP codes in Will County

Population shown

Frequently asked questions

What is the largest city in Will County, IL?: Joliet is the largest city or town in Will County, with about 150,445 residents.
How many ZIP codes are in Will County?: Will County includes 30 ZIP Code Tabulation Areas, including 60401, 60403, 60404, 60408, 60410.
What is the population of Will County, IL?: About 701,462 people live in Will County, based on American Community Survey 5-year estimates.
What counties border Will County?: Will County borders Cook County, DuPage County, Lake County, IN, Kendall County, Kankakee County, Grundy County.