Will County, Illinois

County seat: Joliet · Population 712,253 (2025) · 836 sq mi

Will County is the 4th most populous of Illinois's 102 counties, with 712,253 people (2025 estimate). Its county seat is Joliet. It is part of the Northeast region, one of the 10 Illinois economic development regions (DCEO). The map shows its 37 cities and towns and the 6 neighboring counties.

Map of Will County, Illinois with cities, towns and the county boundary
Will County, Illinois with its cities and towns, unincorporated communities (CDPs) and neighboring counties. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
Download PDF (Letter) 184 KBPNG image 127 KBIllinois county map

Will County facts

County seat
Joliet
Population (2025 estimate)
712,253 +2.1% since 2020
Land area
836 sq mi 13th largest of 102
Water area
13 sq mi
Population density
852 per sq mi
Established
1836
Named after
Conrad Will American physician, politician, and pioneer (1779-1835)
Largest city
Joliet 137,691 in the county
Median household income
$109,984
Cities and towns
37 plus 22 CDPs
ZIP codes
45
Time zone
Central
FIPS code
17197

Cities and towns in Will County

Will County has 37 incorporated cities, towns and villages. Populations count the people living inside Will County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Joliet (county seat)City137,691Kendall County
BolingbrookVillage73,316DuPage County
NapervilleCity52,436DuPage County
PlainfieldVillage46,653Kendall County
RomeovilleVillage41,281
New LenoxVillage28,893
LockportCity27,822
Homer GlenVillage24,873Cook County
FrankfortVillage21,365Cook County
Crest HillCity20,695
MokenaVillage19,897
ShorewoodVillage18,536Kendall County
AuroraCity11,876DuPage, Kane and Kendall counties
ManhattanVillage10,943
ChannahonVillage9,969Grundy County
CreteVillage8,345Cook County
Tinley ParkVillage7,694Cook County
University ParkVillage6,710Cook County
BraidwoodCity6,252Grundy County
WilmingtonCity5,614
StegerVillage5,368Cook County
MoneeVillage5,119
BeecherVillage4,740
PeotoneVillage4,225
Park ForestVillage3,147Cook County
ElwoodVillage2,237
MinookaVillage1,987Grundy and Kendall counties
RockdaleVillage1,969
GodleyVillage584Grundy County
Orland ParkVillage361Cook County
SymertonVillage124
WoodridgeVillage24Cook and DuPage counties
DiamondVillage5Grundy County
Coal CityVillage3Grundy County
LemontVillage3Cook and DuPage counties
BracevilleVillage0Grundy County
OswegoVillage0Kendall County

Unincorporated communities (CDPs)

Census-designated places are communities without their own city government; the county provides their services.

CommunityPopulationAlso in
Frankfort Square9,560
Ingalls Park3,015
Ridgewood2,795
Fairmont2,617
Preston Heights2,449
Willowbrook1,913
Crystal Lawns1,766
Arbury Hills1,519
Sunnyland1,231
Lockport Heights890
Bonnie Brae846
Plum Valley520
Custer Park459
Lakewood Shores459
Rest Haven455
Eagle Lake131
Marley96
Ritchie79
Wilton Center58
Andres41
Lorenzo28
Goodenow0

ZIP codes in Will County

45 ZIP codes reach into Will County. ZIP codes ignore county lines, so some also cover a neighboring county.

Population of Will County, 2020–2025

Will County grew by 14,892 people (+2.1%) between April 2020 and July 2025: 7,968 more births than deaths and a net gain of 6,369 people from migration.

Year (July 1)Population
2020696,901
2021699,920
2022699,112
2023703,872
2024708,980
2025712,253

Neighboring counties

Printable Will County map

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Sources

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