|Butler County, Ohio|
Location in the U.S. state of Ohio
Ohio's location in the U.S.
|Founded||May 1, 1803 |
|Named for||General Richard Butler|
|• Total||470 sq mi (1,217 km2)|
|• Land||467 sq mi (1,210 km2)|
|• Water||3.1 sq mi (8 km2), 0.7%|
|• ( 2017)||380,604|
|• Density||788/sq mi (304/km2)|
|Time zone||Eastern: UTC−5/ −4|
Butler County is a county in the U.S. state of Ohio. As of the 2010 census, the population was 368,130.  Its county seat is Hamilton.  It is named for General Richard Butler, who died in 1791 during St. Clair's Defeat.  Located along the Miami River, it is home to Miami University, an Ohio public university that was founded in 1809 as the second university in the State of Ohio.
- 1 History
- 2 Geography and geology
- 3 Demographics
- 4 Politics
- 5 Education
- 6 Communities
- 7 Notable people
- 8 See also
- 9 References
- 10 Further reading
- 11 External links
Successive cultures of ancient Indigenous peoples of the Americas occupied areas of the county. They built large earthworks, seven of which were still standing and recorded by a Smithsonian survey. 
Early French explorers likely passed through the area along the Miami River.  The gravesites of David and Margaret Gregory indicate they were some of the first white settlers in the area in Liberty Township. White settlers began moving into the area in larger numbers after the 1793 Treaty of Greenville was signed with the Native Americans of the area. 
Butler County was formed on March 24, 1803 from portions of Hamilton County. It is named for General Richard Butler.  Between 1803 and 1823, the townships of the county became officially recognized.  Large portions of the county were held by non-resident owners, including 640 acres owned by future President William H Harrison.  Some land that was originally part of Butler County was reassigned to Warren County in the north and Hamilton County to the south. Butler County's original size was 480 sq miles. 
The Great Flood of 1913 affected much of the county, particularly the communities of Middletown, Ohio where approximately 25% of the town was flooded and 6 people died and Hamilton, Ohio, where 46% of the city was flooded, over 300 buildings destroyed, and at least 98 people killed. 
In 1957 the Ohio Legislature established Hueston Woods State Park, which covers 3,596 acres in Butler and neighboring Preble County. In addition to a 625-acre manmade lake, the park contains the 200-acre Hueston Woods, one of the last near- virgin growths of American beech and maple in Ohio. 
- Preble County (north)
- Montgomery County (northeast)
- Warren County (east)
- Hamilton County (south)
- Dearborn County, Indiana (southwest)
- Franklin County, Indiana (west)
- Union County, Indiana (northwest)
|U.S. Decennial Census
1790-1960  1900-1990 
1990-2000  2010-2017 
As of the census  of 2000, there were 332,807 people, 123,082 households, and 87,880 families residing in the county. The population density was 712 people per square mile (275/km²). There were 129,793 housing units at an average density of 278 per square mile (107/km²). The racial makeup of the county was 91.20% White, 5.27% Black or African American, 0.21% Native American, 1.55% Asian, 0.03% Pacific Islander, 0.62% from other races, and 1.13% from two or more races. 1.43% of the population were Hispanic or Latino of any race. 28.1% were of German, 16.7% American, 10.7% Irish, and 9.8% English ancestry according to Census 2000. Those citing " American" ancestry in Butler County are of overwhelmingly English extraction, however most English Americans identify simply as having American ancestry because their roots have been in North America for so long, in some cases since the 1600s.     
There were 123,082 households out of which 35.50% had children under the age of 18 living with them, 57.00% were married couples living together, 10.70% had a female householder with no husband present, and 28.60% were non-families. 22.70% of all households were made up of individuals and 7.60% had someone living alone who was 65 years of age or older. The average household size was 2.61 and the average family size was 3.07.
In the county, the population was spread out with 25.90% under the age of 18, 11.90% from 18 to 24, 29.80% from 25 to 44, 21.70% from 45 to 64, and 10.70% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 95.30 males. For every 100 females age 18 and over, there were 92.20 males.
The median income for a household in the county was $47,885, and the median income for a family was $57,513. Males had a median income of $42,052 versus $27,602 for females. The per capita income for the county was $22,076. About 5.40% of families and 8.70% of the population were below the poverty line, including 9.10% of those under age 18 and 7.00% of those age 65 or over.
As of the 2010 census, there were 368,130 people, 135,960 households, and 95,404 families residing in the county.  The population density was 788.2 inhabitants per square mile (304.3/km2). There were 148,273 housing units at an average density of 317.5 per square mile (122.6/km2).  The racial makeup of the county was 86.0% white, 7.3% black or African American, 2.4% Asian, 0.2% American Indian, 0.1% Pacific islander, 1.8% from other races, and 2.1% from two or more races. Those of Hispanic or Latino origin made up 4.0% of the population.  In terms of ancestry, 27.0% were German, 14.8% were American, 13.6% were Irish, and 9.7% were English. 
Of the 135,960 households, 35.9% had children under the age of 18 living with them, 52.9% were married couples living together, 12.4% had a female householder with no husband present, 29.8% were non-families, and 23.5% of all households were made up of individuals. The average household size was 2.63 and the average family size was 3.10. The median age was 36.0 years. 
The median income for a household in the county was $54,788 and the median income for a family was $68,539. Males had a median income of $50,499 versus $37,094 for females. The per capita income for the county was $25,892. About 8.3% of families and 12.8% of the population were below the poverty line, including 16.1% of those under age 18 and 6.8% of those age 65 or over. 
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There are sixteen school districts having territory in Butler County.
- Edgewood Local School District (also in Preble)
- Fairfield City School District
- Hamilton City School District
- Lakota Local School District
- Madison Local School District
- Mason City School District (also in Warren)
- Middletown City School District (also in Warren)
- Monroe Local School District (also in Warren)
- New Miami Local School District
- Northwest Local School District (also in Hamilton)
- Preble Shawnee School District (also in Preble)
- Princeton City School District (also in Hamilton and Warren)
- Ross Local School District
- Southwest Local School District (also in Hamilton)
- Talawanda City School District (also in Preble)
- Union County–College Corner Joint School District (also in Preble, as well as Union and Franklin counties in Indiana)
- Ohio House of Representatives, 51st District
- Ohio House of Representatives, 52nd District
- Ohio House of Representatives, 53rd District
- Ohio House of Representatives, 54th District
- Walter Alston, manager of Brooklyn/Los Angeles Dodgers
- John Boehner, congressman, Speaker of the House (January 2011 – October 2015), House Minority Leader (January 2007-January 2011), fmr. House Majority Leader (February 2006 to January 2007)
- Mary Bowermaster, masters athletics record holder
- James E. Campbell, governor of Ohio
- Cris Carter, football player
- Frank Clair, football player
- Ray Combs, television personality
- Greg Dulli, musician
- Weeb Ewbank, football coach
- Andrew L. Harris, governor of Ohio
- Donald Harvey, serial killer
- William Dean Howells, writer
- Lorenzo D. Immell, Medal of Honor recipient in the American Civil War 
- Howard Jones, football coach
- Kenesaw Mountain Landis, federal judge and baseball commissioner
- Mark Lewis, baseball player
- Jerry Lucas, basketball player
- McGuire Sisters, musical group
- Ezra Meeker, Oregon Trail preservationist
- Joe Nuxhall, baseball player (youngest in MLB history) and radio announcer, both for the Cincinnati Reds
- Darrell Pace, Olympic archer
- Clarence Page, columnist
- Nan Phelps, artist
- Charles Francis Richter, scientist devising the Richter magnitude scale for earthquakes
- Charlie Root, baseball player
- Bonnie Rotten, award-winning pornographic actress
- Brady Seals, musician
- Kent Tekulve, baseball player
- Roger Troutman, musician
- C. William Verity, politician and businessman
- Scott Walker, musician
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- Bert S. Barlow, W.H. Todhunter, Stephen D. Cone, Joseph J. Pater, and Frederick Schneider, eds. Centennial History of Butler County, Ohio. Hamilton, Ohio: B.F. Bowen, 1905.
- Jim Blount. The 1900s: 100 Years In the History of Butler County, Ohio. Hamilton, Ohio: Past Present Press, 2000.
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