Colorado

Alamosa

16,376
2020 population
1920
first census record
11
census records

About Alamosa

Alamosa, Colorado, first appears in the United States federal census in 1920, when it recorded a population of 5,148. At the most recent census, in 2020, its population stood at 16,376.

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

On the ground today, 16 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202016,376
201015,445
200014,966
199013,617
198011,799
197011,422
196010,000
195010,531
194010,484
19308,602
19205,148
Source

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

Historic places in Alamosa

National Register of Historic Places listings in Alamosa, Colorado.

Superintendent's Residence, Great Sand Dunes National Monument
Mosca
American National Bank Building
Alamosa
Trujillo Homestead
MOsca
Denver and Rio Grande Railroad Locomotive No.169
Alamosa
Sacred Heart Catholic Church
Alamosa
First Baptist Church
Alamosa
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 Alamosa County, Colorado

This page charts the census history of Alamosa 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 Alamosa

When does Alamosa first appear in the US census?
Alamosa, Colorado first appears in the federal census in 1920, with a recorded population of 5,148.
What is the population of Alamosa?
At the most recent federal census (2020), Alamosa had a recorded population of 16,376.
How many historic places are in Alamosa?
16 sites are listed on the National Register of Historic Places in Alamosa, Colorado.
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