North Dakota

Slope

706
2020 population
1920
first census record
11
census records

About Slope

Slope, North Dakota, first appears in the United States federal census in 1920, when it recorded a population of 4,940. At the most recent census, in 2020, its population stood at 706.

Its recorded population peaked at 4,940 in 1920, and has since declined by roughly 86 percent.

On the ground today, one documented military engagement has been recorded within the county, among them Battle of the Badlands, and 2 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020706
2010727
2000767
1990907
19801,157
19701,484
19601,893
19502,315
19402,932
19304,150
19204,940
Source

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

Battles & engagements in Slope

Military engagements that took place in Slope, North Dakota.

Battle of the Badlands
1864

Historic places in Slope

National Register of Historic Places listings in Slope, North Dakota.

Mystic Theatre
Marmarth
H-T Ranch
Amidon

Other counties in North Dakota

Explore census history and historic records for more North Dakota counties.

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Everything a full report reveals about Slope County, North Dakota

This page charts the census history of Slope County, North Dakota. 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 Slope

When does Slope first appear in the US census?
Slope, North Dakota first appears in the federal census in 1920, with a recorded population of 4,940.
What is the population of Slope?
At the most recent federal census (2020), Slope had a recorded population of 706.
When did Slope's population peak?
Slope's recorded population peaked at 4,940 in 1920.
Were any battles fought in Slope?
1 documented military engagement took place in Slope, including Battle of the Badlands.
How many historic places are in Slope?
2 sites are listed on the National Register of Historic Places in Slope, North Dakota.
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