Macoupin County, Illinois

County seat: Carlinville · Population 43,748 (2025) · 863 sq mi

Macoupin County is the 32nd most populous of Illinois's 102 counties, with 43,748 people (2025 estimate). Its county seat is Carlinville. It is part of the Central region, one of the 10 Illinois economic development regions (DCEO). The map shows its 27 cities and towns and the 6 neighboring counties.

Map of Macoupin County, Illinois with cities, towns and the county boundary
Macoupin 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) 136 KBPNG image 93 KBIllinois county map

Macoupin County facts

County seat
Carlinville
Population (2025 estimate)
43,748 −2.9% since 2020
Land area
863 sq mi 11th largest of 102
Water area
5 sq mi
Population density
51 per sq mi
Established
1829
Named after
Macoupin Creek river in the United States of America
Largest city
Carlinville 5,465
Median household income
$70,805
Cities and towns
27
ZIP codes
28
Time zone
Central
FIPS code
17117

Cities and towns in Macoupin County

Macoupin County has 27 incorporated cities, towns and villages. Populations count the people living inside Macoupin County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Carlinville (county seat)City5,465
StauntonCity4,932
GillespieCity3,083
VirdenCity3,006Sangamon County
Mount OliveCity1,936
BrightonVillage1,864Jersey County
GirardCity1,768
Bunker HillCity1,593
BenldCity1,403
PalmyraVillage591
WilsonvilleVillage529
ShipmanTown504
MedoraVillage361Jersey County
Mount ClareVillage308
SawyervilleVillage258
East GillespieVillage250
White CityVillage221
Lake Ka-HoVillage201
NilwoodTown198
ModestoVillage179
Royal LakesVillage171
ChesterfieldVillage165
HettickVillage147
Standard CityVillage129
DorchesterVillage125
EagarvilleVillage113
ScottvilleVillage99

ZIP codes in Macoupin County

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

Population of Macoupin County, 2020–2025

Macoupin County shrank by 1,296 people (−2.9%) between April 2020 and July 2025: 1,232 more deaths than births and a net loss of 78 people from migration.

Year (July 1)Population
202044,929
202144,621
202244,185
202344,057
202443,917
202543,748

Neighboring counties

Printable Macoupin County map

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Sources

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