Ohio

Miami

108,774
2020 population
1810
first census record
22
census records

About Miami

Miami, Ohio, first appears in the United States federal census in 1810, when it recorded a population of 3,941. At the most recent census, in 2020, its population stood at 108,774.

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

On the ground today, 9 documented military engagements have been recorded within the county, among them Battle of Pickawillany, Pickawillany Massacre 1752, Battle of Piqua, and 46 places are listed on the National Register of Historic Places.

Population by decade

Census YearPopulationChart
2020108,774
2010102,506
200098,868
199093,182
198090,381
197084,342
196072,901
195061,309
194052,632
193051,301
192048,428
191045,047
190043,105
189039,754
188036,158
187032,740
186029,959
185024,999
184019,688
183012,807
18208,851
18103,941
Source

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

Battles & engagements in Miami

Military engagements that took place in Miami, Ohio.

Battle of Pickawillany
1752
Pickawillany Massacre 1752
1752
Battle of Piqua
1780
Battle of Piqua (Clark's Ohio Expedition)
1780
Battle of Piqua / Girty's Town
1780
Battle of Pekowee
1780
Battle of Piqua (Ohio 1780)
1780
Battle of Piqua (1780)
1780
Morgan's Raid — Piqua Ohio Area
1863

Historic places in Miami

National Register of Historic Places listings in Miami, Ohio.

Arrowston
Piqua
Zollinger, S., Company Building
Piqua
Iddings, Benjamin, Log House
Troy
Lockington Locks Historical Area
Lockington
Overfield Tavern
Troy
Miami County Courthouse and Power Station
Troy
Baumgardner, William, House and Farm Buildings
New Carlisle
First Presbyterian Church
Troy
Fort Piqua Hotel
Piqua
Pleasant Hill United Church of Christ
Pleasant Hill
African Jackson Cemetery
Piqua
Casstown Lutheran Stone Church
Casstown
Eldean Covered Bridge
Troy
Browse all Ohiohistoric sites ›

Other counties in Ohio

Explore census history and historic records for more Ohio counties.

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Unlimited access

Everything a full report reveals about Miami County, Ohio

This page charts the census history of Miami 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 Miami

When does Miami first appear in the US census?
Miami, Ohio first appears in the federal census in 1810, with a recorded population of 3,941.
What is the population of Miami?
At the most recent federal census (2020), Miami had a recorded population of 108,774.
Were any battles fought in Miami?
9 documented military engagements took place in Miami, including Battle of Pickawillany, Pickawillany Massacre 1752, Battle of Piqua.
How many historic places are in Miami?
46 sites are listed on the National Register of Historic Places in Miami, Ohio.
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