Illinois

Piatt

16,673
2020 population
1850
first census record
18
census records

About Piatt

Piatt, Illinois, first appears in the United States federal census in 1850, when it recorded a population of 1,606. At the most recent census, in 2020, its population stood at 16,673.

Its recorded population peaked at 17,706 in 1900, and has since declined by roughly 6 percent.

On the ground today, 6 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202016,673
201016,729
200016,365
199015,548
198016,581
197015,509
196014,960
195013,970
194014,659
193015,588
192015,714
191016,376
190017,706
189017,062
188015,583
187010,953
18606,127
18501,606
Source

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

Historic places in Piatt

National Register of Historic Places listings in Piatt, Illinois.

Voorhies Castle
Bement
North State Street Historic District
Monticello
Monticello Courthouse Square Historic District
Monticello
South Charter Street Historic District
Monticello
Allerton, Robert, Estate
Monticello
Bryant, Francis E., House
Bement

Other counties in Illinois

Explore census history and historic records for more Illinois counties.

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Everything a full report reveals about Piatt County, Illinois

This page charts the census history of Piatt 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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Explore Illinois records

Illinoishistory ›NRHP historic sites ›Notable people from Illinois›

Frequently asked about Piatt

When does Piatt first appear in the US census?
Piatt, Illinois first appears in the federal census in 1850, with a recorded population of 1,606.
What is the population of Piatt?
At the most recent federal census (2020), Piatt had a recorded population of 16,673.
When did Piatt's population peak?
Piatt's recorded population peaked at 17,706 in 1900.
How many historic places are in Piatt?
6 sites are listed on the National Register of Historic Places in Piatt, Illinois.
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