Illinois

Hancock

17,620
2020 population
1830
first census record
20
census records

About Hancock

Hancock, Illinois, first appears in the United States federal census in 1830, when it recorded a population of 483. At the most recent census, in 2020, its population stood at 17,620.

Its recorded population peaked at 35,935 in 1870, and has since declined by roughly 51 percent.

On the ground today, one documented military engagement has been recorded within the county, among them Black Hawk War: Battle of Fort Hamilton Illinois 1832, and 10 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202017,620
201019,104
200020,121
199021,373
198023,877
197023,645
196024,574
195025,790
194026,297
193026,420
192028,523
191030,638
190032,215
189031,907
188035,337
187035,935
186029,061
185014,652
18409,946
1830483
Source

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

Battles & engagements in Hancock

Military engagements that took place in Hancock, Illinois.

Black Hawk War: Battle of Fort Hamilton Illinois 1832
1832

Historic places in Hancock

National Register of Historic Places listings in Hancock, Illinois.

Felt, Cyrus, House
Hamilton
Carthage Jail
Carthage
Warsaw Historic District
Warsaw
Hunziker Winery Site
Warsaw
Nauvoo Historic District
Nauvoo
Cambre House and Farm
Niota
Carthage Courthouse Square Historic District
Carthage
LaHarpe Historic District
LaHarpe
Reimbold, William J., House
Nauvoo
LaHarpe City Hall
LaHarpe

Other counties in Illinois

Explore census history and historic records for more Illinois counties.

PopePulaskiPutnamRandolphRichlandRock IslandSalineSangamonSchuylerScottShelbySt. ClairStarkStephensonTazewellUnionVermilionWabashWarrenWashington
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Everything a full report reveals about Hancock County, Illinois

This page charts the census history of Hancock 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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Frequently asked about Hancock

When does Hancock first appear in the US census?
Hancock, Illinois first appears in the federal census in 1830, with a recorded population of 483.
What is the population of Hancock?
At the most recent federal census (2020), Hancock had a recorded population of 17,620.
When did Hancock's population peak?
Hancock's recorded population peaked at 35,935 in 1870.
Were any battles fought in Hancock?
1 documented military engagement took place in Hancock, including Black Hawk War: Battle of Fort Hamilton Illinois 1832.
How many historic places are in Hancock?
10 sites are listed on the National Register of Historic Places in Hancock, Illinois.
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