Pennsylvania

Blair

122,822

2020 population

1850

first census record

census records

About Blair

Blair, Pennsylvania, first appears in the United States federal census in 1850, when it recorded a population of 21,777. At the most recent census, in 2020, its population stood at 122,822.

Its recorded population peaked at 140,358 in 1940, and has since declined by roughly 12 percent.

On the ground today, 31 places are listed on the National Register of Historic Places.

Population by decade

Census Year	Population	Chart
2020	122,822
2010	127,089
2000	129,144
1990	130,542
1980	136,621
1970	135,356
1960	137,270
1950	139,514
1940	140,358
1930	139,840
1920	128,334
1910	108,858
1900	85,099
1890	70,866
1880	52,740
1870	38,051
1860	27,829
1850	21,777

Source

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

Historic places in Blair

National Register of Historic Places listings in Blair, Pennsylvania.

Allegheny Portage Railroad National Historic Site

Tyrone Borough Historic District

Blair County Courthouse

Hollidaysburg

Central Trust Company Buildings

Altoona

Williamsburg Historic District

Williamsburg

Roaring Spring Historic District

Roaring Spring

Isett, Jacob, House and Store

Arch Spring

Broad Avenue Historic District

Altoona

Altoona Armory

Altoona

Llyswen Historic District

Altoona

Downtown Altoona Historic District

Altoona

Downtown Altoona Historic District (Boundary Increase)

Altoona

Hollidaysburg Historic District

Hollidaysburg

Penn Alto Hotel

Altoona

Knickerbocker Historic District

Browse all Pennsylvaniahistoric sites ›

Other counties in Pennsylvania

Explore census history and historic records for more Pennsylvania counties.

Bradford Bucks Butler Cambria Cameron Carbon Centre Chester Clarion Clearfield Clinton Columbia Crawford Cumberland Dauphin Delaware Elk Erie Fayette Forest

Unlimited access

Everything a full report reveals about Blair County, Pennsylvania

This page charts the census history of Blair County, Pennsylvania. 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 Blair County, Pennsylvania report

Or see a real report first

Explore Pennsylvania records

Pennsylvaniahistory ›NRHP historic sites ›Notable people from Pennsylvania›

Frequently asked about Blair

When does Blair first appear in the US census?

Blair, Pennsylvania first appears in the federal census in 1850, with a recorded population of 21,777.

What is the population of Blair?

At the most recent federal census (2020), Blair had a recorded population of 122,822.

When did Blair's population peak?

Blair's recorded population peaked at 140,358 in 1940.

How many historic places are in Blair?

31 sites are listed on the National Register of Historic Places in Blair, Pennsylvania.

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