Illinois

Mason

13,086
2020 population
1850
first census record
18
census records

About Mason

Mason, Illinois, first appears in the United States federal census in 1850, when it recorded a population of 5,921. At the most recent census, in 2020, its population stood at 13,086.

Its recorded population peaked at 19,492 in 1980, and has since declined by roughly 33 percent.

On the ground today, 4 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202013,086
201014,666
200016,038
199016,269
198019,492
197016,161
196015,193
195015,326
194015,358
193015,115
192016,634
191017,377
190017,491
189016,067
188016,242
187016,184
186010,931
18505,921
Source

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

Historic places in Mason

National Register of Historic Places listings in Mason, Illinois.

Rockwell Mound
Havana
Havana Water Tower
Havana
Clear Lake Site
Manito
Havana Public Library
Havana

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Everything a full report reveals about Mason County, Illinois

This page charts the census history of Mason 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 Mason

When does Mason first appear in the US census?
Mason, Illinois first appears in the federal census in 1850, with a recorded population of 5,921.
What is the population of Mason?
At the most recent federal census (2020), Mason had a recorded population of 13,086.
When did Mason's population peak?
Mason's recorded population peaked at 19,492 in 1980.
How many historic places are in Mason?
4 sites are listed on the National Register of Historic Places in Mason, Illinois.
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