Pennsylvania

Lehigh

374,557
2020 population
1820
first census record
21
census records

About Lehigh

Lehigh, Pennsylvania, first appears in the United States federal census in 1820, when it recorded a population of 18,895. At the most recent census, in 2020, its population stood at 374,557.

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 Fries' Rebellion, and 58 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020374,557
2010349,497
2000312,090
1990291,130
1980272,349
1970255,304
1960227,536
1950198,207
1940177,533
1930172,893
1920148,101
1910118,832
190093,893
189076,631
188065,969
187056,796
186043,753
185032,479
184025,787
183022,256
182018,895
Source

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

Battles & engagements in Lehigh

Military engagements that took place in Lehigh, Pennsylvania.

Fries' Rebellion
1799

Historic places in Lehigh

National Register of Historic Places listings in Lehigh, Pennsylvania.

Allentown Masonic Temple
Allentown
Hotel Sterling
Allentown
Catasauqua Residential Historic District
Catasauqua
Gauff-Roth House
Allentown
Taylor, George, House
Catasauqua
Wehr Covered Bridge
Orefield
Centennial Bridge
Center Valley
Dime Savings and Trust Company
Allentown
Bethlehem Armory
Bethlehem
Troxell-Steckel House
Egypt
Slatington Historic District
Slatington
Cold Spring Bridge
North Hampton
Schlicher, George F., Hotel
Alburtis
Trout Hall
Allentown
Kemmerer House
Emmaus
Neuweiler Brewery
Allentown
Lock Ridge Furnance Complex
Alburtis
Meyers, Albertus L., Bridge
Allentown
Burnside Plantation
Bethlehem
Shelter House
Emmaus
Allentown National Bank
Allentown
Dorneyville Crossroad Settlement
Allentown
Rodale Organic Gardening Experimental Farm
Lower Macungie township
Martin Tower
Bethlehem
Browse all Pennsylvaniahistoric sites ›

Other counties in Pennsylvania

Explore census history and historic records for more Pennsylvania counties.

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Everything a full report reveals about Lehigh County, Pennsylvania

This page charts the census history of Lehigh 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 Lehigh

When does Lehigh first appear in the US census?
Lehigh, Pennsylvania first appears in the federal census in 1820, with a recorded population of 18,895.
What is the population of Lehigh?
At the most recent federal census (2020), Lehigh had a recorded population of 374,557.
Were any battles fought in Lehigh?
1 documented military engagement took place in Lehigh, including Fries' Rebellion.
How many historic places are in Lehigh?
58 sites are listed on the National Register of Historic Places in Lehigh, Pennsylvania.
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