Ohio

Union

62,784

2020 population

1820

first census record

census records

About Union

Union, Ohio, first appears in the United States federal census in 1820, when it recorded a population of 1,996. At the most recent census, in 2020, its population stood at 62,784.

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

On the ground today, 11 places are listed on the National Register of Historic Places.

Population by decade

Census Year	Population	Chart
2020	62,784
2010	52,300
2000	40,909
1990	31,969
1980	29,536
1970	23,786
1960	22,853
1950	20,687
1940	20,012
1930	19,192
1920	20,918
1910	21,871
1900	22,342
1890	22,860
1880	22,375
1870	18,730
1860	16,507
1850	12,204
1840	8,422
1830	3,192
1820	1,996

Source

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

Historic places in Union

National Register of Historic Places listings in Union, Ohio.

Browse all Ohiohistoric sites ›

Other counties in Ohio

Explore census history and historic records for more Ohio counties.

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Everything a full report reveals about Union County, Ohio

This page charts the census history of Union 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 Union

When does Union first appear in the US census?

Union, Ohio first appears in the federal census in 1820, with a recorded population of 1,996.

What is the population of Union?

At the most recent federal census (2020), Union had a recorded population of 62,784.

How many historic places are in Union?

11 sites are listed on the National Register of Historic Places in Union, Ohio.

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