Ohio

Hardin

30,696
2020 population
1820
first census record
21
census records

About Hardin

Hardin, Ohio, first appears in the United States federal census in 1820, when it recorded a population of 22. At the most recent census, in 2020, its population stood at 30,696.

Its recorded population peaked at 32,719 in 1980, and has since declined by roughly 6 percent.

On the ground today, 7 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
202030,696
201032,058
200031,945
199031,111
198032,719
197030,813
196029,633
195028,673
194027,061
193027,635
192029,167
191030,407
190031,187
189028,939
188027,023
187018,714
186013,570
18508,251
18404,598
1830210
182022
Source

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

Historic places in Hardin

National Register of Historic Places listings in Hardin, Ohio.

Zimmerman Kame
Roundhead
Ada Pennsylvania Station and Railroad Park
Ada
Mount Victory Historic District
Mount Victory
Hardin County Courthouse
Kenton
Kenton Public Library
Kenton
North Main-North Detroit Street Historic District
Kenton
Browse all Ohiohistoric sites ›

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Everything a full report reveals about Hardin County, Ohio

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

When does Hardin first appear in the US census?
Hardin, Ohio first appears in the federal census in 1820, with a recorded population of 22.
What is the population of Hardin?
At the most recent federal census (2020), Hardin had a recorded population of 30,696.
When did Hardin's population peak?
Hardin's recorded population peaked at 32,719 in 1980.
How many historic places are in Hardin?
7 sites are listed on the National Register of Historic Places in Hardin, Ohio.
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