Missouri

Marion

28,525
2020 population
1830
first census record
20
census records

About Marion

Marion, Missouri, first appears in the United States federal census in 1830, when it recorded a population of 4,837. At the most recent census, in 2020, its population stood at 28,525.

Its recorded population peaked at 33,493 in 1930, and has since declined by roughly 15 percent.

On the ground today, 8 documented military engagements have been recorded within the county, among them Palmyra Skirmish (1861), Hannibal Railroad Raid 1861, Hannibal Skirmish 1862, and 40 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202028,525
201028,781
200028,289
199027,682
198028,638
197028,121
196029,522
195029,765
194031,576
193033,493
192030,226
191030,572
190026,331
189026,233
188024,837
187023,780
186018,838
185012,230
18409,623
18304,837
Source

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

Battles & engagements in Marion

Military engagements that took place in Marion, Missouri.

Palmyra Skirmish (1861)
1861
Hannibal Railroad Raid 1861
1861
Hannibal Skirmish 1862
1862
Raid on Palmyra Missouri (Palmyra Massacre)
1862
Palmyra Railroad Raid (1862)
1862
Palmyra Massacre (Marion County, Oct 1862)
1862
Palmyra Executions Skirmish
1862
Massacre at Palmyra (Missouri)
1862

Historic places in Marion

National Register of Historic Places listings in Marion, Missouri.

Masterson, Robert, House
Hannibal
Horr, Benjamin, House
Hannibal
Rockcliffe Mansion
Hannibal
Culbertson-Head Farmstead
Palmyra
Ebert-Dulany House
Hannibal
Marion County Jail and Jailor's House
Palmyra
Maple Avenue Historic District
Hannibal
Walker-Woodward-Schaffer House
Palmyra
Mark Twain Historic District
Hannibal
Hendren Farm
Hannibal
Riverview Park
Hannibal
Clemens Field
Hannibal
St. Elizabeth Hospital
Hannibal
Federal Building
Hannibal
Central Park Historic District
Hannibal
North Main Street Historic District
Hannibal
Broadway District
Hannibal
Hannibal Old Police Station and Jail
Hannibal
Mark Twain Hotel
Hannibal
Browse all Missourihistoric sites ›

Other counties in Missouri

Explore census history and historic records for more Missouri counties.

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Unlimited access

Everything a full report reveals about Marion County, Missouri

This page charts the census history of Marion 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 Marion

When does Marion first appear in the US census?
Marion, Missouri first appears in the federal census in 1830, with a recorded population of 4,837.
What is the population of Marion?
At the most recent federal census (2020), Marion had a recorded population of 28,525.
When did Marion's population peak?
Marion's recorded population peaked at 33,493 in 1930.
Were any battles fought in Marion?
8 documented military engagements took place in Marion, including Palmyra Skirmish (1861), Hannibal Railroad Raid 1861, Hannibal Skirmish 1862.
How many historic places are in Marion?
40 sites are listed on the National Register of Historic Places in Marion, Missouri.
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