Idaho

Boundary

12,056
2020 population
1920
first census record
11
census records

About Boundary

Boundary, Idaho, first appears in the United States federal census in 1920, when it recorded a population of 4,474. At the most recent census, in 2020, its population stood at 12,056.

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

On the ground today, one documented military engagement has been recorded within the county, among them Ruby Ridge 1992, and 9 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202012,056
201010,972
20009,871
19908,332
19807,289
19706,371
19605,809
19505,908
19405,987
19304,555
19204,474
Source

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

Battles & engagements in Boundary

Military engagements that took place in Boundary, Idaho.

Ruby Ridge 1992
1992

Historic places in Boundary

National Register of Historic Places listings in Boundary, Idaho.

Spokane & International Railroad Construction Camp
Eastport
Snyder Guard Station Historical District
Eastport
U.S. Inspection Statio-Porthill, Idaho
Porthill
Boundary County Courthouse
Bonners Ferry
Harvey Mountain Quarry
Bonners Ferry
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Explore census history and historic records for more Idaho counties.

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Everything a full report reveals about Boundary County, Idaho

This page charts the census history of Boundary 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 Boundary

When does Boundary first appear in the US census?
Boundary, Idaho first appears in the federal census in 1920, with a recorded population of 4,474.
What is the population of Boundary?
At the most recent federal census (2020), Boundary had a recorded population of 12,056.
Were any battles fought in Boundary?
1 documented military engagement took place in Boundary, including Ruby Ridge 1992.
How many historic places are in Boundary?
9 sites are listed on the National Register of Historic Places in Boundary, Idaho.
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