Missouri

Mercer

3,538
2020 population
1850
first census record
18
census records

About Mercer

Mercer, Missouri, first appears in the United States federal census in 1850, when it recorded a population of 2,691. At the most recent census, in 2020, its population stood at 3,538.

Its recorded population peaked at 14,706 in 1900, and has since declined by roughly 76 percent.

On the ground today, 3 documented military engagements have been recorded within the county, among them Princeton MO Skirmish (Mercer County), Mercer County MO Guerrilla Raids (1863), Princeton MO Second Engagement (Mercer County, 1863), and 2 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
20203,538
20103,785
20003,757
19903,723
19804,685
19704,910
19605,750
19507,235
19408,766
19309,350
192011,281
191012,335
190014,706
189014,581
188014,673
187011,557
18609,300
18502,691
Source

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

Battles & engagements in Mercer

Military engagements that took place in Mercer, Missouri.

Princeton MO Skirmish (Mercer County)
1862
Mercer County MO Guerrilla Raids (1863)
1863
Princeton MO Second Engagement (Mercer County, 1863)
1863

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Everything a full report reveals about Mercer County, Missouri

This page charts the census history of Mercer County, Missouri. 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 Mercer

When does Mercer first appear in the US census?
Mercer, Missouri first appears in the federal census in 1850, with a recorded population of 2,691.
What is the population of Mercer?
At the most recent federal census (2020), Mercer had a recorded population of 3,538.
When did Mercer's population peak?
Mercer's recorded population peaked at 14,706 in 1900.
Were any battles fought in Mercer?
3 documented military engagements took place in Mercer, including Princeton MO Skirmish (Mercer County), Mercer County MO Guerrilla Raids (1863), Princeton MO Second Engagement (Mercer County, 1863).
How many historic places are in Mercer?
2 sites are listed on the National Register of Historic Places in Mercer, Missouri.
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