Iowa

Marion

33,414
2020 population
1850
first census record
18
census records

About Marion

Marion, Iowa, first appears in the United States federal census in 1850, when it recorded a population of 5,482. At the most recent census, in 2020, its population stood at 33,414.

The county's recorded population has risen across the decades to its highest level in 2020.

On the ground today, 28 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202033,414
201033,309
200032,052
199030,001
198029,669
197026,352
196025,886
195025,930
194027,019
193025,727
192024,957
191022,995
190024,159
189023,058
188025,111
187024,436
186016,813
18505,482
Source

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

Historic places in Marion

National Register of Historic Places listings in Marion, Iowa.

Hays, E. R., House
Knoxville
St. Joseph's Roman Catholic Church and Cemetery Historic District
Lacona
Peoples Nationals Bank
Pella
Ten Hagen Cottage-Stegman Store
Pella
Coal Ridge Baptist Church and Cemetery
Knoxville
Harvey Railroad Bridge
Harvey
Hammond Bridge
Hamilton
Tuttle, Thomas F. and Nancy, House
Pella
Wabash Railroad Bridge
Pella
Ellis, Evan F., Farmhouse
Bussey
Van Loon, Dirk, House
Pella
Porter-Rhynsburger House
Pella
Knoxville WPA Athletic Field Historic District
Knoxville
Vander Wilt, Dirk and Cornelia J., Cottage
Pella
East Amsterdam School
Pella
Van Den Berg, Hendrik J. and Wilhelmina H., Cottage
Pella
Koelman, Philipus J. and Cornelia, House
Pella
First Christian Church
Pella
Van Maren, Henry and Johanna, House-Diamond Filling Station
Pella
Collegiate Neighborhood Historic District
Pella
Knoxville Veterans Administration Hospital Historic District
Knoxville
Scholte, Dominie Henry P., House
Pella
Van Asch, William, House-Huibert Debooy Commercial Room
Pella
Van Spanckeren, B. H. and J. H. H., Row Houses
Pella
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Other counties in Iowa

Explore census history and historic records for more Iowa counties.

Cerro GordoCherokeeChickasawClarkeClayClaytonClintonCrawfordDallasDavisDecaturDelawareDes MoinesDickinsonDubuqueEmmetFayetteFloydFranklinFremont
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Everything a full report reveals about Marion County, Iowa

This page charts the census history of Marion County, Iowa. 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, Iowa first appears in the federal census in 1850, with a recorded population of 5,482.
What is the population of Marion?
At the most recent federal census (2020), Marion had a recorded population of 33,414.
How many historic places are in Marion?
28 sites are listed on the National Register of Historic Places in Marion, Iowa.
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