Miami

Formed March 1, 1807 (24^th county)

Miami County (108,777), Troy (26,318)

The classic 1888 Beaux Arts courthouse is located on Short Street between Main and Water streets.  Ohio State Highway 41 is Main Street in the town.  Joseph Warren Yost is the building architect.  The building was being remodeled in 2019.  It features a domed tower with a working clock and statues.  Statues on the roof of the courthouse are not just decorative; they are symbols that represent life in Miami County: justice in the county court, agriculture, education, industry and transportation. They have sometimes been referred to as “seven allegorical figures.”  A wooden courthouse existed in 1811 in Troy, the only county seat.  An Administration Center has been added in 1972.  The county was organized on March 1, 1807 from Montgomery County as the 24^th county.  Miami County is named for the Native American tribe.  The county seat is named for the ancient Greek city. 

Miami County government consists of a sheriff and 3 Commissioners.  Three Common Pleas Court Judges serve Miami County.  Miami County is in the western part of the state.  Dayton, Ohio is south and Columbus, Ohio is east of the county.  The county center is in Troy 2.6 miles Northwest of the city center.  The county is surrounded clockwise by Shelby, Champaign, Clark, Montgomery, and Darke counties. 

The area of the county is 407.0 square miles.  It is 70 out of 88 in the state.  It ranks 25 out of 88 in population in the state.  It has a density of 267.3 persons per square mile making it 22 out of 88 in the state.  Miami County has 67.7% of its population in its incorporated areas.  Interstate Highway 75 crosses the county north to south from Shelby County to Montgomery County.  United States Highway 36 goes east to west from Champaign County to Darke County.  United States Highway 40 clips the southeast corner from Clark County, east, to Montgomery County, south.  The county is a rectangle with an added foot on the southeast corner.  Troy is located in the southern third of the county.  Troy is the county seat and the largest city.  It is 24.2% of the county population.  The county is pronounced MIE-AM-EE.  This county is in the Dayton Metropolitan Statistical Area.