|Montgomery County, Ohio|
Current Montgomery County Courthouse
Location within the U.S. state of Ohio
Ohio's location within the U.S.
|Founded||May 1, 1803 |
|Named for||Richard Montgomery|
|• Total||464 sq mi (1,202 km2)|
|• Land||462 sq mi (1,197 km2)|
|• Water||2.8 sq mi (7 km2), 0.6%|
|• ( 2017)||531,542|
|• Density||1,159/sq mi (447/km2)|
|Time zone||Eastern: UTC−5/ −4|
Montgomery County is a county located in the U.S. state of Ohio. As of the 2010 census, the population was 535,153,  making it the fifth-most populous county in Ohio.  The county seat is Dayton.  The county was named in honor of Richard Montgomery, an American Revolutionary War general killed in 1775 while attempting to capture Quebec City, Canada. 
Montgomery County is part of the Dayton, Ohio Metropolitan Statistical Area.
- 1 Geography
- 2 Demographics
- 3 Government
- 4 Education
- 5 Communities
- 6 See also
- 7 References
- 8 External links
- Miami County (north)
- Clark County (northeast)
- Greene County (east)
- Warren County (south)
- Butler County (southwest)
- Preble County (west)
- Darke County (northwest)
|U.S. Decennial Census
1790-1960  1900-1990 
1990-2000  2010-2017 
As of the census of 2000, there were 559,062 people, 229,229 households, and 146,935 families residing in the county. The population density was 1,211 people per square mile (468/km²). There were 248,443 housing units at an average density of 538 per square mile (208/km²). The racial makeup of the county was 76.57% White, 19.86% Black or African American, 0.23% Native American, 1.31% Asian, 0.04% Pacific Islander, 0.49% from other races, and 1.51% from two or more races. 1.27% of the population were Hispanic or Latino of any race.
There were 229,229 households out of which 29.60% had children under the age of 18 living with them, 46.30% were married couples living together, 13.80% had a female householder with no husband present, and 35.90% were non-families. 30.40% of all households were made up of individuals, and 10.10% had someone living alone who was 65 years of age or older. The average household size was 2.37, and the average family size was 2.96.
In the county, the population was spread out with 24.70% under the age of 18, 9.70% from 18 to 24, 29.00% from 25 to 44, 22.90% from 45 to 64, and 13.70% who were 65 years of age or older. The median age was 36 years. For every 100 females, there were 92.30 males. For every 100 females age 18 and over, there were 88.60 males.
The median income for a household in the county was $40,156, and the median income for a family was $50,071. Males had a median income of $38,710 versus $27,297 for females. The per capita income for the county was $21,743. About 8.30% of families and 11.30% of the population were below the poverty line, including 15.60% of those under age 18 and 8.20% of those age 65 or over.
As of the 2010 Census, there were 535,153 people, 223,943 households, and 138,060 families residing in the county.  The population density was 1,159.5 inhabitants per square mile (447.7/km2). There were 254,775 housing units at an average density of 552.0 per square mile (213.1/km2).  The racial makeup of the county was 73.9% white, 20.9% black or African American, 1.7% Asian, 0.2% American Indian, 0.8% from other races, and 2.4% from two or more races. Those of Hispanic or Latino origin made up 2.3% of the population.  In terms of ancestry, 24.9% were German, 12.8% were Irish, 9.7% were American, and 8.8% were English. 
Of the 223,943 households, 29.7% had children under the age of 18 living with them, 41.6% were married couples living together, 15.3% had a female householder with no husband present, 38.4% were non-families, and 32.2% of all households were made up of individuals. The average household size was 2.33, and the average family size was 2.94. The median age was 39.2 years. 
The median income for a household in the county was $43,965, and the median income for a family was $56,559. Males had a median income of $45,680 versus $34,991 for females. The per capita income for the county was $24,828. About 11.7% of families and 15.7% of the population were below the poverty line, including 22.7% of those under age 18 and 8.7% of those age 65 or over. 
- Board of Commissioners:
- Dan Foley (D)
- Debbie Lieberman (D)
- County Auditor: Karl L. Keith (D)
- Clerk of Courts: Russ M. Joseph (D)
- County Coroner: Dr. Kent Harshbarger
- County Engineer: Paul Gruner (D)
- County Prosecutor: Mathias H. Heck Jr. (D)
- County Recorder: Brandon McClain (D)
- Sheriff: Phil Plummer (R)
- County Treasurer: Carolyn Rice (D)
In the six presidential elections until 2016, Montgomery County has favored the Democratic candidate, but not by large margins. However, in 2016, Republican Donald Trump defeated Democrat Hillary Clinton. It's also the most populated county in Ohio to go for Trump in 2016.
- Air Force Institute of Technology (actually located in Wright-Patterson AFB, Ohio).
- Sinclair Community College
- Wright State University (actually located in neighbouring Greene County, Ohio, but uses a Dayton address).
The following public school districts are located partially or entirely in Montgomery County:
- Local School Districts
The Dayton Regional STEM School
New Lebanon Local Schools
- Dixie High School, Dixie (the Greyhounds)
Jefferson Township Local Schools
- Jefferson Township High School, Dayton (the Broncos)
Northridge Local School District
- Northridge High School (the Polar Bears)
Mad River Local Schools
- Walter E. Stebbins High School, Riverside (the Indians)
Valley View Local Schools
- Valley View High School, Germantown (the Spartans)
- New Lebanon Local Schools
- City School Districts
Centerville City Schools
- Centerville High School, Centerville (the Elks)
Dayton Public Schools
- Belmont High School for Computer Technology/Engineering, Dayton (the Bison)
- Thurgood Marshall High School for the Arts, Dayton (the Cougars)
- Dayton Early College Academy, Dayton
- Dunbar High School for Professional Studies, Dayton (the Wolverines)
- Meadowdale High School for Cultural Studies/International Baccalaureate, Dayton (the Lions)
- Stivers School for the Arts, Dayton (Tigers)
Huber Heights City Schools
- Wayne High School, Huber Heights (the Warriors)
Kettering City School District
Fairmont High School, Kettering (the Firebirds)
- (merger of the former Fairmont East and Fairmont West high schools (the East Falcons and the West Dragons)
- Fairmont High School, Kettering (the Firebirds)
Miamisburg City Schools
- Miamisburg High School, Miamisburg (the Vikings)
Northmont City Schools
- Northmont High School, Clayton (the Thunderbolts)
Oakwood City School District
- Oakwood High School, Oakwood (the Lumberjacks)
Trotwood-Madison City Schools
- Trotwood-Madison High School, Trotwood (the Rams)
Vandalia Butler City Schools
- Butler High School, Vandalia (the Aviators)
West Carrollton Schools
- West Carrollton Senior High School, West Carrollton (the Pirates)
- Centerville City Schools
- Carlisle High School, Carlisle (the Indians)
The following private high schools are located in Montgomery County:
- Archbishop Alter High School, Kettering (the Knights) ( Roman Catholic)
- Carroll High School, Dayton (the Patriots) (Roman Catholic)
- Chaminade Julienne High School, Dayton (Eagles) (Roman Catholic/ Marianist)
- Dayton Christian High School, Dayton (the Warriors) ( nondenominational Christian)
- Miami Valley School, Dayton (the Rams) ( nonsectarian)
- Spring Valley Academy, Centerville ( Seventh-day Adventist)
- Mad River (remnant merged with the Village of Riverside in 1994)
- Madison (remnant merged with the Village of Trotwood in 1996)
- Randolph (remnant merged with the Village of Clayton in 1998)
- Van Buren (partitioned between the municipalities of Kettering and Moraine in 1952-1953) 
- Wayne (incorporated as Huber Heights in 1981)
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- "Find a County". National Association of Counties. Retrieved 2011-06-07.
- "Montgomery County data". Ohio State University Extension Data Center. Archived from the original on 2008-03-27. Retrieved 2007-04-28.
- "2010 Census Gazetteer Files". United States Census Bureau. August 22, 2012. Archived from the original on May 4, 2014. Retrieved February 9, 2015.
- "Population and Housing Unit Estimates". Retrieved November 6, 2018.
- "U.S. Decennial Census". United States Census Bureau. Retrieved February 9, 2015.
- "Historical Census Browser". University of Virginia Library. Retrieved February 9, 2015.
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- "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. April 2, 2001. Retrieved February 9, 2015.
- "DP-1 Profile of General Population and Housing Characteristics: 2010 Demographic Profile Data". United States Census Bureau. Retrieved 2015-12-27.
- "Population, Housing Units, Area, and Density: 2010 - County". United States Census Bureau. Retrieved 2015-12-27.
- "DP02 SELECTED SOCIAL CHARACTERISTICS IN THE UNITED STATES – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Retrieved 2015-12-27.
- "DP03 SELECTED ECONOMIC CHARACTERISTICS – 2006-2010 American Community Survey 5-Year Estimates". United States Census Bureau. Retrieved 2015-12-27.
- Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Retrieved 3 April 2018.
- "The City of Moraine -". The City of Moraine. Retrieved 3 April 2018.