Ogle County, Illinois

County seat: Oregon · Population 51,399 (2025) · 759 sq mi

Ogle County is the 28th most populous of Illinois's 102 counties, with 51,399 people (2025 estimate). Its county seat is Oregon. It is part of the Northern Stateline region, one of the 10 Illinois economic development regions (DCEO). The map shows its 14 cities and towns and the 7 neighboring counties.

Map of Ogle County, Illinois with cities, towns and the county boundary
Ogle 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) 101 KBPNG image 65 KBIllinois county map

Ogle County facts

County seat
Oregon
Population (2025 estimate)
51,399 −0.9% since 2020
Land area
759 sq mi 17th largest of 102
Water area
5 sq mi
Population density
68 per sq mi
Established
1836
Named after
Joseph Ogle US Army officer (1737–1821)
Largest city
Rochelle 9,498 in the county
Median household income
$82,132
Cities and towns
14 plus 5 CDPs
ZIP codes
27
Time zone
Central
FIPS code
17141

Cities and towns in Ogle County

Ogle County has 14 incorporated cities, towns and villages. Populations count the people living inside Ogle County; cities that cross a county line also list the other counties.

NameTypePopulation 2025Also in
RochelleCity9,498Lee County
ByronCity3,777
Oregon (county seat)City3,573
Mount MorrisVillage2,787
Davis JunctionVillage2,566
PoloCity2,235
ForrestonVillage1,402
HillcrestVillage1,210
Stillman ValleyVillage1,058
CrestonVillage637
Leaf RiverVillage417
Monroe CenterVillage406
AdelineVillage72
RockfordCity0Winnebago County

Unincorporated communities (CDPs)

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

CommunityPopulationAlso in
Lost Nation714
Kings332
Grand Detour297
Holcomb152
Baileyville47Stephenson County

ZIP codes in Ogle County

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

Population of Ogle County, 2020–2025

Ogle County shrank by 451 people (−0.9%) between April 2020 and July 2025: 371 more deaths than births and a net loss of 70 people from migration.

Year (July 1)Population
202051,765
202151,560
202251,441
202351,369
202451,274
202551,399

Neighboring counties

Printable Ogle 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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