Miami County, Ohio

Miami County: County in Ohio, United States


Miami County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 102,506 and a population density of 97 people per km². After 10 years in 2020 county had an estimated population of 107,516 inhabitants. Its county seat is Troy. The county was created 216 years ago in 1807.

Quick Facts about Miami County

Population : 107,516 (2020)
Country : United States of America
State : Ohio (United States)
Different from : Miami-Dade County, Miami County, Miami County
Plate code : 55
Area : 1060 km2
Water as percent of area : 0.8%
Land as percent of area : 99.2%
Named for : Miami people
Altitude : 886 feet / 270 meters
Capital : Troy
Establishment : January 01, 1807
Time Zone : America/New_York
Local time : 21:53:17 (3rd June 2023)
Density : 101 Pop. per km² as of 2020
Population growth : 4.66% (2010-2020)
Miami County locator map
Location of Miami County on Ohio map.
Troy-ohio-courthouse image
Troy-ohio-courthouse image


Miami County is located at 40°3'12"N 84°13'44"W (40.0534500, -84.2288500). It has 5 neighbors: Clark County, Montgomery County, Champaign County, Darke County and Shelby County.

Miami County map

The largest city of Miami County is Troy with a population of 26,473. Other cities include, Piqua population 21,435, Tipp City population 10,115, West Milton population 4,853 and Laura population 497. See all Miami County cities & populated places.

Miami County Populated Places

Cities, Towns, Neighborhoods & Other Populated Places in Miami County.

City Name Population Title
Troy 26,473 City in Miami County, Ohio, United States
Piqua 21,435 City in Ohio
Tipp City 10,115 City in Miami County, Ohio, United States of America
West Milton 4,853 City in Ohio
Covington 2,718 Village in Miami County, Ohio
Bradford 1,871 Village in Darke and Miami counties, Ohio, United States
Laura 497 Human settlement in Miami County, Ohio, United States of America
Fletcher 486 Human settlement in Miami County, Ohio, United States of America
Potsdam 295 Village in Ohio
Casstown 277 Human settlement in Miami County, Ohio, United States of America
Ludlow Falls 217 Human settlement in Miami County, Ohio, United States of America
Nashville 183 Village in Ohio, United States

Miami County has 5 neighbours.

  • Troy


The population of Miami County increased by 4.66% in 10 years.

Year Population % Change Method
2010 102,506 - census
2011 102,734 0.22% estimation process
2012 102,934 0.19% estimation process
2013 103,213 0.27% estimation process
2014 103,856 0.62% estimation process
2015 104,075 0.21% estimation process
2016 104,553 0.46% estimation process
2017 105,200 0.62% estimation process
2018 106,042 0.79% estimation process
2019 106,987 0.88% estimation process
2020 107,516 0.49% estimation process

Comitatul Miami, Comte de Miami, Comté de Miami, Condado de Miami, Condado han Miami, Contea di Miami, Hrabstwo Miami, Majami, Miami, Miami Comitatus, Miami Kun, Miami Kūn, Miami konderria, Miami megye, Miamin piirikunta, Okrug Majami, Quan Miami, Quận Miami, mai a mi xian, maiami jun, mayami ka'unti, mqatʿt myamy, shhrstan myamy awhayw, Майами, Маями, Маямі, Округ Мајами, شهرستان میامی، اوهایو, مایامی کاؤنٹی, مقاطعة ميامي, میامی کاؤنٹی، اوہائیو, মায়ামি কাউন্টি, マイアミ郡, 邁阿密縣

People born in Miami County (6)

People born in Miami County, including astronomer Edwin Foster Coddington, Director of the United States Mint Frank Edgar Scobey, Ohio state judge and later a United States federal judge Lester LeFevre Cecil, .


  • Luther Merritt Swygert (United States federal judge) he was born in 05/02/1905
  • Martin K. Gantz (American politician) he was born in 28/01/1862
  • Aaron Franklin Shull (zoologist, university professor and author) he was born in 01/08/1881

Other places with the same name (3)

Ohio Other Counties (more counties)

County Name Population Title
Franklin County 1,324,624 County in Massachusetts, United States
Cuyahoga County 1,227,883 County in Ohio, United States
Columbus 884,356 Capital city of Ohio, United States
Hamilton County 817,985 County in New York, United States
Summit County 538,866 County in northern Utah, United States
Montgomery County 531,610 County in Ohio, United States
Lucas County 428,294 County in Ohio, United States
Butler County 385,648 County in Ohio, United States of America
Cleveland 378,589 City in Ohio, United States
Stark County 369,772 County in Ohio, United States
Lorain County 312,172 County in Ohio, United States
Cincinnati 304,548 City in Ohio, United States; county seat of Hamilton County
Toledo 271,455 County seat of Lucas County, Ohio, United States
Warren County 238,412 County in New York, United States
Lake County 229,569 County in Ohio, United States
Mahoning County 226,075 County in Ohio, United States