New York

Seneca

33,814
2020 population
1810
first census record
22
census records

About Seneca

Seneca, New York, first appears in the United States federal census in 1810, when it recorded a population of 16,609. At the most recent census, in 2020, its population stood at 33,814.

Its recorded population peaked at 35,251 in 2010, and has since declined by roughly 4 percent.

On the ground today, 2 documented military engagements have been recorded within the county, among them Huron-Iroquois Pre-Contact Conflict – Frontenac Island, Action at Cayuga Lake (Sullivan Campaign), and 41 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202033,814
201035,251
200033,342
199033,683
198033,733
197035,083
196031,984
195029,253
194025,732
193024,983
192024,735
191026,972
190028,114
189028,227
188029,278
187027,823
186028,138
185025,441
184024,874
183021,041
182023,619
181016,609
Source

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

Battles & engagements in Seneca

Military engagements that took place in Seneca, New York.

Huron-Iroquois Pre-Contact Conflict – Frontenac Island
1100
Action at Cayuga Lake (Sullivan Campaign)
1779

Historic places in Seneca

National Register of Historic Places listings in Seneca, New York.

First Presbyterian Church
Waterloo
Burton, William H., House
Waterloo
Bloomer, Amelia, House
Seneca Falls
Saint Paul's Church
Waterloo
Lay, Hiram, Cobblestone Farmhouse
Tyre
Rose Hill
Fayette
Lodi Methodist Church
Lodi
Seneca County Courthouse Complex at Ovid
Ovid
Waterloo Library
Waterloo
Bull, Julius and Harriet, House
Seneca Falls
Hunt House
Waterloo
M'Clintock House
Waterloo
Fall Street-Trinity Lane Historic District
Seneca Falls
Ritter, Simon, Cobblestone Farmhouse
Varick
Hoster, William, House
Fayette
Women's Rights National Historical Park
Seneca Falls
Queen's Castle
Lodi
Willard Asylum for the Chronic Insane
Willard
United Methodist Church
Waterloo
US Post Office-Seneca Falls
Seneca Falls
Wesleyan Methodist Church
Seneca Falls
Kinne, David and Mary, Farmstead
Ovid
Webster, James Russell, House
Waterloo
Cobblestone Farmhouse at 1229 Birdsey Road
Junius
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Other counties in New York

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Everything a full report reveals about Seneca County, New York

This page charts the census history of Seneca County, New York. 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 Seneca

When does Seneca first appear in the US census?
Seneca, New York first appears in the federal census in 1810, with a recorded population of 16,609.
What is the population of Seneca?
At the most recent federal census (2020), Seneca had a recorded population of 33,814.
When did Seneca's population peak?
Seneca's recorded population peaked at 35,251 in 2010.
Were any battles fought in Seneca?
2 documented military engagements took place in Seneca, including Huron-Iroquois Pre-Contact Conflict – Frontenac Island, Action at Cayuga Lake (Sullivan Campaign).
How many historic places are in Seneca?
41 sites are listed on the National Register of Historic Places in Seneca, New York.
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