Pennsylvania

Northumberland

91,647
2020 population
1790
first census record
24
census records

About Northumberland

Northumberland, Pennsylvania, first appears in the United States federal census in 1790, when it recorded a population of 17,161. At the most recent census, in 2020, its population stood at 91,647.

Its recorded population peaked at 128,504 in 1930, and has since declined by roughly 29 percent.

On the ground today, 2 documented military engagements have been recorded within the county, among them Attack on Fort Augusta (PA, 1763), Raid on Northumberland (1778), and 29 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202091,647
201094,528
200094,556
199096,771
1980100,381
197099,190
1960104,138
1950117,115
1940126,887
1930128,504
1920122,079
1910111,420
190090,911
189074,698
188053,123
187041,444
186028,922
185023,272
184020,027
183018,133
182015,424
181036,327
180027,797
179017,161
Source

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

Battles & engagements in Northumberland

Military engagements that took place in Northumberland, Pennsylvania.

Attack on Fort Augusta (PA, 1763)
1763
Raid on Northumberland (1778)
1778

Historic places in Northumberland

National Register of Historic Places listings in Northumberland, Pennsylvania.

Sunbury Historic District
Sunbury
Priestley, Joseph, House
Northumberland
Milton Historic District
Milton
Allenwood River Bridge
Allenwood
Sodom Schoolhouse
Montandon
Zion Stone Church
Augustaville
Northumberland County Courthouse
Sunbury
Sunbury Armory
Sunbury
Brown, Gottlieb, Covered Bridge
Potts Grove
Warrior Run Presbyterian Church
McEwensville
Kirk, William, House
Turbotville
Pennsylvania Canal and Limestone Run Aqueduct
Milton
Milton Armory
Milton
Northumberland Historic District
Northumberland
Cameron, Col. James, House
Milton
Milton Freight Station
Milton
Knoebel, Lawrence L., Covered Bridge
Knoebel's Grove
Priestley, Dr. Joseph, House
Northumberland
Snyder, Caspar, House
Sunbury
Beck House
Sunbury
Hower-Slote House
Turbotville
Kreigbaum Covered Bridge
Elysburg
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Other counties in Pennsylvania

Explore census history and historic records for more Pennsylvania counties.

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Everything a full report reveals about Northumberland County, Pennsylvania

This page charts the census history of Northumberland 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.
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Frequently asked about Northumberland

When does Northumberland first appear in the US census?
Northumberland, Pennsylvania first appears in the federal census in 1790, with a recorded population of 17,161.
What is the population of Northumberland?
At the most recent federal census (2020), Northumberland had a recorded population of 91,647.
When did Northumberland's population peak?
Northumberland's recorded population peaked at 128,504 in 1930.
Were any battles fought in Northumberland?
2 documented military engagements took place in Northumberland, including Attack on Fort Augusta (PA, 1763), Raid on Northumberland (1778).
How many historic places are in Northumberland?
29 sites are listed on the National Register of Historic Places in Northumberland, Pennsylvania.
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