Kansas

Allen

12,526
2020 population
1860
first census record
17
census records

About Allen

Allen, Kansas, first appears in the United States federal census in 1860, when it recorded a population of 3,082. At the most recent census, in 2020, its population stood at 12,526.

Its recorded population peaked at 27,640 in 1910, and has since declined by roughly 55 percent.

On the ground today, 4 documented military engagements have been recorded within the county, among them Sacking of Humboldt, Kansas (1861), Raid on Humboldt, Raid on Humboldt Kansas (Quantrill), and 6 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202012,526
201013,371
200014,385
199014,638
198015,654
197015,043
196016,369
195018,187
194019,874
193021,391
192023,509
191027,640
190019,507
189013,509
188011,303
18707,022
18603,082
Source

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

Battles & engagements in Allen

Military engagements that took place in Allen, Kansas.

Sacking of Humboldt, Kansas (1861)
1861
Raid on Humboldt
1861
Raid on Humboldt Kansas (Quantrill)
1862
Skirmish at Iola
1862

Historic places in Allen

National Register of Historic Places listings in Allen, Kansas.

Northrup House
Iola
Allen County Jail
Iola
Kress Building (S.H. Kress & Company Store)
Iola
Browse all Kansashistoric sites ›

Other counties in Kansas

Explore census history and historic records for more Kansas counties.

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Everything a full report reveals about Allen County, Kansas

This page charts the census history of Allen County, Kansas. 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 Allen

When does Allen first appear in the US census?
Allen, Kansas first appears in the federal census in 1860, with a recorded population of 3,082.
What is the population of Allen?
At the most recent federal census (2020), Allen had a recorded population of 12,526.
When did Allen's population peak?
Allen's recorded population peaked at 27,640 in 1910.
Were any battles fought in Allen?
4 documented military engagements took place in Allen, including Sacking of Humboldt, Kansas (1861), Raid on Humboldt, Raid on Humboldt Kansas (Quantrill).
How many historic places are in Allen?
6 sites are listed on the National Register of Historic Places in Allen, Kansas.
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