Tazewell County, Illinois

County seat: Pekin · Population 130,049 (2025) · 647 sq mi

Tazewell County is the 16th most populous of Illinois's 102 counties, with 130,049 people (2025 estimate). Its county seat is Pekin. It is part of the North Central region, one of the 10 Illinois economic development regions (DCEO). The map shows its 18 cities and towns and the 6 neighboring counties.

Map of Tazewell County, Illinois with cities, towns and the county boundary
Tazewell 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) 123 KBPNG image 86 KBIllinois county map

Tazewell County facts

County seat
Pekin
Population (2025 estimate)
130,049 −1.2% since 2020
Land area
647 sq mi 29th largest of 102
Water area
12 sq mi
Population density
201 per sq mi
Established
1827
Named after
Littleton Waller Tazewell American politician (1774-1860)
Largest city
Pekin 31,277 in the county
Median household income
$77,982
Cities and towns
18 plus 1 CDPs
ZIP codes
21
Time zone
Central
FIPS code
17179

Cities and towns in Tazewell County

Tazewell County has 18 incorporated cities, towns and villages. Populations count the people living inside Tazewell County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
Pekin (county seat)City31,277Peoria County
East PeoriaCity22,088
MortonVillage17,565
WashingtonCity15,902
Creve CoeurVillage4,816
Marquette HeightsCity2,485
TremontVillage2,243
MackinawVillage1,851
DelavanCity1,548
North PekinVillage1,447
MinierVillage1,138
South PekinVillage964
HopedaleVillage806
Deer CreekVillage626Woodford County
Green ValleyVillage604
ArmingtonVillage303
GoodfieldVillage258Woodford County
Peoria HeightsVillage0Peoria County

Unincorporated communities (CDPs)

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

CommunityPopulationAlso in
Heritage Lake1,522

ZIP codes in Tazewell County

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

Population of Tazewell County, 2020–2025

Tazewell County shrank by 1,507 people (−1.2%) between April 2020 and July 2025: 1,828 more deaths than births and a net gain of 355 people from migration.

Year (July 1)Population
2020131,300
2021130,661
2022129,891
2023130,019
2024129,982
2025130,049

Neighboring counties

Printable Tazewell County map

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Sources

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