Ohio

Warren

242,337
2020 population
1810
first census record
22
census records

About Warren

Warren, Ohio, first appears in the United States federal census in 1810, when it recorded a population of 9,925. At the most recent census, in 2020, its population stood at 242,337.

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

On the ground today, 2 documented military engagements have been recorded within the county, among them Fort Ancient Culture Warfare (Anderson Site), Fort Ancient Culture Warfare, and 54 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020242,337
2010212,693
2000158,383
1990113,909
198099,276
197084,925
196065,711
195038,505
194029,894
193027,348
192025,716
191024,497
190025,584
189025,468
188028,392
187026,689
186026,902
185025,560
184023,141
183021,468
182017,837
18109,925
Source

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

Battles & engagements in Warren

Military engagements that took place in Warren, Ohio.

Fort Ancient Culture Warfare (Anderson Site)
1000
Fort Ancient Culture Warfare
1100

Historic places in Warren

National Register of Historic Places listings in Warren, Ohio.

Fort Ancient
Lebanon
Old Log Post Office
Franklin
Mohrman-Jack-Evans House
Lebanon
Floraville Historic District
Lebanon
Bone Mound II
Oregonia
Bone Stone Graves
Oregonia
Golden Lamb
Lebanon
Glendower
Lebanon
Mackinaw Historic District
Franklin
Moar Mound And Village
Morrow
Wright, Dr. Aaron, House
Springboro
Waynesville Main Street Historic District
Waynesville
Butler, Charles, House
Franklin
Peters Cartridge Company
Kings Mills
Stubbs Earthworks
Morrow
Browse all Ohiohistoric sites ›

Other counties in Ohio

Explore census history and historic records for more Ohio counties.

FairfieldFayetteFranklinFultonGalliaGeaugaGreeneGuernseyHamiltonHancockHardinHarrisonHenryHighlandHockingHolmesHuronJacksonJeffersonKnox
Unlimited access

Everything a full report reveals about Warren County, Ohio

This page charts the census history of Warren County, Ohio. 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 Warren County, Ohio report
Or see a real report first

Explore Ohio records

Ohiohistory ›NRHP historic sites ›Notable people from Ohio›

Frequently asked about Warren

When does Warren first appear in the US census?
Warren, Ohio first appears in the federal census in 1810, with a recorded population of 9,925.
What is the population of Warren?
At the most recent federal census (2020), Warren had a recorded population of 242,337.
Were any battles fought in Warren?
2 documented military engagements took place in Warren, including Fort Ancient Culture Warfare (Anderson Site), Fort Ancient Culture Warfare.
How many historic places are in Warren?
54 sites are listed on the National Register of Historic Places in Warren, Ohio.
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 locationView a free sample report