Lake County, Indiana

County seat: Crown Point · Population 504,612 (2025) · 499 sq mi

Lake County is the 2nd most populous of Indiana's 92 counties, with 504,612 people (2025 estimate). Its county seat is Crown Point. It is part of the Northwest (Region 1) region, one of the 12 Indiana economic growth regions (DWD / WorkOne regions). The map shows its 19 cities and towns and the 6 neighboring counties.

Map of Lake County, Indiana with cities, towns and the county boundary
Lake County, Indiana 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) 120 KBPNG image 103 KBIndiana county map

Lake County facts

County seat
Crown Point
Population (2025 estimate)
504,612 +1.2% since 2020
Land area
499 sq mi 11th largest of 92
Water area
128 sq mi
Population density
1,012 per sq mi
Established
1837
Named after
Lake Michigan one of the Great Lakes of North America
Largest city
Hammond 75,712
Median household income
$71,493
Cities and towns
19 plus 5 CDPs
ZIP codes
28
Time zone
Central
FIPS code
18089

Cities and towns in Lake County

Lake County has 19 incorporated cities, towns and villages. Populations count the people living inside Lake County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
HammondCity75,712
GaryCity67,289
MerrillvilleTown37,407
Crown Point (county seat)City35,616
ScherervilleTown29,825
HobartCity29,298
East ChicagoCity25,610
St. JohnTown24,841
MunsterTown23,504
HighlandTown23,409
Cedar LakeTown16,789
DyerTown16,273
GriffithTown16,137
Lake StationCity12,977
LowellTown11,853
WinfieldTown9,140
WhitingCity4,479
New ChicagoTown1,988
SchneiderTown261

Unincorporated communities (CDPs)

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

CommunityPopulationAlso in
Ross6,751
Lakes of the Four Seasons3,952Porter County
Lake Dalecarlia1,169
Shelby164
Leroy85

ZIP codes in Lake County

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

Population of Lake County, 2020–2025

Lake County grew by 5,917 people (+1.2%) between April 2020 and July 2025: 1,748 more deaths than births and a net gain of 7,579 people from migration.

Year (July 1)Population
2020498,943
2021499,015
2022499,630
2023500,134
2024502,497
2025504,612

Neighboring counties

Printable Lake County map

The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.

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Sources

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