Sangamon County, Illinois

County seat: Springfield · Population 194,170 (2025) · 868 sq mi

Sangamon County is the 11th most populous of Illinois's 102 counties, with 194,170 people (2025 estimate). Its county seat is Springfield, which is also the state capital. It is part of the Central region, one of the 10 Illinois economic development regions (DCEO). The map shows its 26 cities and towns and the 8 neighboring counties.

Map of Sangamon County, Illinois with cities, towns and the county boundary
Sangamon 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) 137 KBPNG image 88 KBIllinois county map

Sangamon County facts

County seat
Springfield
Population (2025 estimate)
194,170 −1.1% since 2020
Land area
868 sq mi 9th largest of 102
Water area
9 sq mi
Population density
224 per sq mi
Established
1821
Named after
Sangamon River river in Illinois, United States
Largest city
Springfield 112,989
Median household income
$75,357
Cities and towns
26
ZIP codes
30
Time zone
Central
FIPS code
17167

Cities and towns in Sangamon County

Sangamon County has 26 incorporated cities, towns and villages. Populations count the people living inside Sangamon County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Springfield (county seat)City112,989
ChathamVillage14,579
ShermanVillage4,644
AuburnCity4,442
RochesterVillage4,093
RivertonVillage3,471
PawneeVillage2,686
JeromeVillage1,627
Southern ViewVillage1,540
WilliamsvilleVillage1,437
Leland GroveCity1,401
GrandviewVillage1,389
New BerlinVillage1,361
DivernonVillage1,107
IlliopolisVillage832
Pleasant PlainsVillage823
LoamiVillage790
SpauldingVillage790
MechanicsburgVillage661
ThayerVillage615
DawsonVillage507
BuffaloVillage437
CurranVillage209
BerlinVillage144
VirdenCity143Macoupin County
CantrallVillage138

ZIP codes in Sangamon County

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

Population of Sangamon County, 2020–2025

Sangamon County shrank by 2,235 people (−1.1%) between April 2020 and July 2025: 842 more deaths than births and a net loss of 1,601 people from migration.

Year (July 1)Population
2020196,202
2021196,165
2022194,221
2023193,962
2024194,036
2025194,170

Neighboring counties

Printable Sangamon 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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