Illinois

Sangamon

196,343
2020 population
1830
first census record
20
census records

About Sangamon

Sangamon, Illinois, first appears in the United States federal census in 1830, when it recorded a population of 12,960. At the most recent census, in 2020, its population stood at 196,343.

Its recorded population peaked at 197,465 in 2010, and has since declined by roughly 1 percent.

On the ground today, one documented military engagement has been recorded within the county, among them Camp Butler Operations, and 66 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020196,343
2010197,465
2000188,951
1990178,386
1980176,089
1970161,335
1960146,539
1950131,484
1940117,912
1930111,733
1920100,262
191091,024
190071,593
189061,195
188052,894
187046,352
186032,274
185019,228
184014,716
183012,960
Source

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

Battles & engagements in Sangamon

Military engagements that took place in Sangamon, Illinois.

Camp Butler Operations
1861

Historic places in Sangamon

National Register of Historic Places listings in Sangamon, Illinois.

Dana, Susan Lawrence, House
Springfield
Lincoln Tomb
Springfield
Camp Butler National Cemetery
Springfield
Lincoln, Abraham, Memorial Garden
Springfield
Executive Mansion
Springfield
US ARMY Aircraft P-51D-25NA 44-73287
Springfield
Camp Lincoln Commissary Building
Springfield
Central Springfield Historic District (Boundary Increase)
Springfield
Lincoln Home National Historic Site
Springfield
Taft Farmstead
Rochester
Lincoln Colored Home
Springfield
Tiger-Anderson House
Springfield
Heimberger House
Springfield
Brunk Farmstead
Rochester
Edwards Place
Springfield
Boult, H. P., House
Springfield
Hickox Apartments
Springfield
Illinois Department of Mines and Minerals-Springfield Mine Rescue Station
Springfield
Compton, Dr. Charles, House
Springfield
Bressmer-Baker House
Springfield
Price-Prather House
Williamsville
Old State Capitol
Springfield
Graham, Cong. James M., House
Springfield
Ross, Joseph, House
Rochester
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 Sangamon County, Illinois

This page charts the census history of Sangamon 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 Sangamon

When does Sangamon first appear in the US census?
Sangamon, Illinois first appears in the federal census in 1830, with a recorded population of 12,960.
What is the population of Sangamon?
At the most recent federal census (2020), Sangamon had a recorded population of 196,343.
When did Sangamon's population peak?
Sangamon's recorded population peaked at 197,465 in 2010.
Were any battles fought in Sangamon?
1 documented military engagement took place in Sangamon, including Camp Butler Operations.
How many historic places are in Sangamon?
66 sites are listed on the National Register of Historic Places in Sangamon, Illinois.
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