Colorado

Douglas

357,978

2020 population

1870

first census record

census records

About Douglas

Douglas, Colorado, first appears in the United States federal census in 1870, when it recorded a population of 1,388. At the most recent census, in 2020, its population stood at 357,978.

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

On the ground today, 29 places are listed on the National Register of Historic Places.

Population by decade

Census Year	Population	Chart
2020	357,978
2010	285,465
2000	175,766
1990	60,391
1980	25,153
1970	8,407
1960	4,816
1950	3,507
1940	3,496
1930	3,498
1920	3,517
1910	3,192
1900	3,120
1890	3,006
1880	2,486
1870	1,388

Source

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

Historic places in Douglas

National Register of Historic Places listings in Douglas, Colorado.

Cherokee Ranch

Sedalia

First National Bank of Douglas County

Ruth Memorial Methodist Episcopal Church

Parker

Pike's Peak Grange No. 163

Franktown

Church of St. Philip-in-the-Field and Bear Canon Cemetery

Sedalia

Lamb Spring

Littleton

Santa Fe Railway Water Tank

Roxborough State Park Archaeological District

Waterton

Hammar, Benjamin, House

Castle Rock

Sinclaire, Reginald, House

Larkspur

Louviers Village Club

Louviers

Browse all Coloradohistoric sites ›

Other counties in Colorado

Explore census history and historic records for more Colorado counties.

La Plata Lake Larimer Las Animas Lincoln Logan Mesa Mineral Moffat Montezuma Montrose Morgan Otero Ouray Park Phillips Pitkin Prowers Pueblo Rio Blanco

Unlimited access

Everything a full report reveals about Douglas County, Colorado

This page charts the census history of Douglas 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.

First month just $5.99, then $11.99 a month. Unlimited locations, cancel anytime.

Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.

Start your Douglas County, Colorado report

Or see a real report first

Explore Colorado records

Coloradohistory ›NRHP historic sites ›Notable people from Colorado›

Frequently asked about Douglas

When does Douglas first appear in the US census?

Douglas, Colorado first appears in the federal census in 1870, with a recorded population of 1,388.

What is the population of Douglas?

At the most recent federal census (2020), Douglas had a recorded population of 357,978.

How many historic places are in Douglas?

29 sites are listed on the National Register of Historic Places in Douglas, Colorado.

Aubrey Research

Research the history of any US location

Aubrey searches federal archives, archaeological records, historic registers, and primary sources to build a full historical report for any address or place in the United States.

Research your location View a free sample report