Idaho

Ada

494,967
2020 population
1870
first census record
16
census records

About Ada

Ada, Idaho, first appears in the United States federal census in 1870, when it recorded a population of 2,675. At the most recent census, in 2020, its population stood at 494,967.

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

On the ground today, 176 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020494,967
2010392,365
2000300,904
1990205,775
1980173,036
1970112,230
196093,460
195070,649
194050,401
193037,925
192035,213
191029,088
190011,559
18908,368
18804,674
18702,675
Source

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

Historic places in Ada

National Register of Historic Places listings in Ada, Idaho.

Reiger, Fred, Houses
Boise
Hays, Samuel, House
Boise
Longfellow School
Boise
GAR Hall
Boise
Daly, John, House
Boise
Moore-Cunningham House
Boise
Whitney School
Boise
Hunt, E. F., House
Meridian
Boise Junior High School
Boise
Boise High School Campus
Boise
Abbs, Walter, House
Boise
Chinese Odd Fellows Building
Boise
Immanuel Methodist Episcopal Church
Boise
Sensenig, Emerson and Lucretia, House
Boise
Funsten, Bishop, House
Boise
Gakey, J. H., House
Boise
Guernsey Dairy Milk Depot
Boise
Stephan, Louis, House
Boise
Jones, T. J., Apartments
Boise
Logan, Thomas E., House
Boise
Morris Hill Cemetery Mausoleum
Boise
Pierce Park School
Boise
Harrison Boulevard Historic District
Boise
Rosedale Odd Fellows Temple
Boise
Browse all Idahohistoric sites ›

Other counties in Idaho

Explore census history and historic records for more Idaho counties.

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Everything a full report reveals about Ada County, Idaho

This page charts the census history of Ada County, Idaho. 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 Ada

When does Ada first appear in the US census?
Ada, Idaho first appears in the federal census in 1870, with a recorded population of 2,675.
What is the population of Ada?
At the most recent federal census (2020), Ada had a recorded population of 494,967.
How many historic places are in Ada?
176 sites are listed on the National Register of Historic Places in Ada, Idaho.
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