Illinois

Henry

49,284
2020 population
1830
first census record
20
census records

About Henry

Henry, Illinois, first appears in the United States federal census in 1830, when it recorded a population of 41. At the most recent census, in 2020, its population stood at 49,284.

Its recorded population peaked at 57,968 in 1980, and has since declined by roughly 15 percent.

On the ground today, one documented military engagement has been recorded within the county, among them Burning of Saukenuk, and 29 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202049,284
201050,486
200051,020
199051,159
198057,968
197053,217
196049,317
195046,492
194043,798
193043,851
192045,162
191041,736
190040,049
189033,338
188036,597
187035,506
186020,660
18503,807
18401,260
183041
Source

Population data from the United States decennial census, U.S. Census Bureau (public domain).

Battles & engagements in Henry

Military engagements that took place in Henry, Illinois.

Burning of Saukenuk
1832

Historic places in Henry

National Register of Historic Places listings in Henry, Illinois.

Lind, Jenny, Chapel
Andover
Francis, Frederick, Woodland Palace
Kewanee
Andover Chapter House
Andover
Henry County Courthouse
Cambridge
Music Pavilion
Orion
Annawan Chapter House
Annawan
West Water Tower and Ground Storage Tank
Orion
Atkinson Hall
Genesco
Kewanee Public Library
Kewanee
Johnson, Olof, House
Galva
Galva Opera House
Galva
Bishop Hill Historic District
Bishop Hill
Ryan Round Barn
Kewanee
Kewanee Hotel
Kewanee
Browse all Illinoishistoric sites ›

Other counties in Illinois

Explore census history and historic records for more Illinois counties.

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Everything a full report reveals about Henry County, Illinois

This page charts the census history of Henry County, Illinois. A full Aubrey report for an address here pulls together everything the historical record holds about the ground, from the earliest settlement to the twentieth century:

Overview
An interactive map of the location with historic sites, battles and Native heritage plotted, and its full story era by era.
The Land
The historic sites and place names around the location, and how this land was settled and used.
Geology
The bedrock beneath the site, its age and rock type, reaching back millions of years.
LiDAR Terrain
Laser-scanned terrain that reveals earthworks and old features hidden in the landscape.
Conflict & War
The battles, raids and skirmishes fought near here, across every era of American conflict.
The Civil War
The Civil War on this ground, 1861 to 1865: who held it, and the battles, camps and regiments nearby.
The Soldiers
The men who marched from here in the Civil War, named and traced where the record allows.
Native Heritage
The Native nations who held this land, mapped across time from before European contact to today.
Settlement
Who claimed and held this ground, from Indigenous homelands through the colonial powers to the United States.
The Community
How the town grew, who came, and what kind of place it became, traced through the census record.
Rivers & Rail
The rivers, canals and railroads that connected this place between 1830 and 1911.
Notable People
The people born, buried or genuinely tied to this exact place, with their stories.
Historical Maps
Historic maps of the location layered over how it looks today.
Finds & Access
Museum objects tied to the area, and the laws on searching, collecting and access here.
Literature
The old books, county histories and archives that mention this place, quoted with their sources.
Spotlight
A deep dive into the most remarkable, lesser-known history of the place, traced back to the record.
Points of Interest
The most significant historic sites and landmarks near the location, and why they matter.
Timeline
The whole story of the location told era by era, from first peoples to the present day.
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Illinoishistory ›NRHP historic sites ›Notable people from Illinois›

Frequently asked about Henry

When does Henry first appear in the US census?
Henry, Illinois first appears in the federal census in 1830, with a recorded population of 41.
What is the population of Henry?
At the most recent federal census (2020), Henry had a recorded population of 49,284.
When did Henry's population peak?
Henry's recorded population peaked at 57,968 in 1980.
Were any battles fought in Henry?
1 documented military engagement took place in Henry, including Burning of Saukenuk.
How many historic places are in Henry?
29 sites are listed on the National Register of Historic Places in Henry, Illinois.
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