Colorado

Adams

519,572
2020 population
1910
first census record
12
census records

About Adams

Adams, Colorado, first appears in the United States federal census in 1910, when it recorded a population of 8,892. At the most recent census, in 2020, its population stood at 519,572.

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

On the ground today, 2 documented military engagements have been recorded within the county, among them Hungate Family Massacre Near Denver (June 11, 1864), Denver Road Closure — Cheyenne Raids August 1864, and 20 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020519,572
2010441,603
2000363,857
1990265,038
1980245,944
1970185,789
1960120,296
195040,234
194022,481
193020,245
192014,430
19108,892
Source

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

Battles & engagements in Adams

Military engagements that took place in Adams, Colorado.

Hungate Family Massacre Near Denver (June 11, 1864)
1864
Denver Road Closure — Cheyenne Raids August 1864
1864

Historic places in Adams

National Register of Historic Places listings in Adams, Colorado.

Union High School
Westminster
Fuller, Granville, House
Aurora
Brighton High School
Brighton
Riverside Cemetery
Denver
Westminster University
Westminster
Adams County Courthouse
Brighton
Bromley Farm-Koizuma Hishinuma Farm
Brighton
Eastlake Farmers Co-Operative Elevator Company
Thornton
Brannan Sand and Gravel Pit #8-Lake Sangraco Boathouse Complex
Denver
Bowles House
Westminster
Robidoux, M.J. Lavina, House
Aurora
Browse all Coloradohistoric sites ›

Other counties in Colorado

Explore census history and historic records for more Colorado counties.

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Everything a full report reveals about Adams County, Colorado

This page charts the census history of Adams County, Colorado. 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 Adams

When does Adams first appear in the US census?
Adams, Colorado first appears in the federal census in 1910, with a recorded population of 8,892.
What is the population of Adams?
At the most recent federal census (2020), Adams had a recorded population of 519,572.
Were any battles fought in Adams?
2 documented military engagements took place in Adams, including Hungate Family Massacre Near Denver (June 11, 1864), Denver Road Closure — Cheyenne Raids August 1864.
How many historic places are in Adams?
20 sites are listed on the National Register of Historic Places in Adams, Colorado.
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