The Hamilton County Ohio

Hamilton County is a county in the southwest corner of the U.S. state of Ohio. The county is called for the first Secretary of the Treasury, Alexander Hamilton. Hamilton County is part of the Cincinnati-Middletown, OH-KY-IN Metropolitan Statistical Area.

Hamilton County Data

Coordinates: 39°12′N 84°32′W
Country  United States
State  Ohio
Founded January 2, 1790
Named for Alexander Hamilton
Seat Cincinnati
Largest city Cincinnati


 • Total 413 sq mi (1,070 km2)
 • Land 406 sq mi (1,050 km2)
 • Water 6.7 sq mi (17 km2)  1.6%%



 • Estimate

 • Density 1,987/sq mi (767/km2)
Time zone UTC−5 (Eastern)
 • Summer (DST) UTC−4 (EDT)
Congressional districts 1st, 2nd



The southern part of Hamilton County was originally owned and surveyed by John Cleves Symmes, and the area was a part of the Symmes Purchase. The first settlers rafted down the Ohio River in 1788 following the American Revolutionary War. They developed the towns of Losantiville (later on Cincinnati), North Bend, and Columbia.

Hamilton County was organized in 1790 by order of Arthur St. Clair, guv of the Northwest Territory, as the second county in the Northwest Territory. Cincinnati was named as the seat. Residents called the county in honor of Alexander Hamilton, who was the very first Secretary of the Treasury of the United States and a creator of the Federalist Party. Its initial boundaries were those specified for the Symmes purchase contract in 1788: the Ohio River in the South, Great Miami River to the west, the Lesser Miami River to the east, and the Cayuhoga River to the North. Its area then included about one-eighth of Ohio, and had about 2,000 occupants (not consisting of the staying Native Americans). The county was significantly broadened in 1792 to include what is today the lower peninsula of Michigan. Since 1796, other counties were produced from Hamilton, minimizing the county to its present size.

The county was the place of much of the Northwest Indian War both prior to and after its organization. Hamilton County government employment.

The United States forcibly removed the majority of the Shawnee and other Indian individuals to move to locations west of the Mississippi River in the 1820s. Rapid development took place during the 1830s and 1840s as the area brought in lots of German and Irish immigrants, specifically after the Great Famine in Ireland and the revolutions in Germany in 1848.

During the Civil War, Morgan’s Raid (a Confederate cavalry project from Kentucky) travelled through the northern part of the county during the summer season of 1863.

Geographical functions

The county lies in an area of mild hills formed by the slopes of the Ohio River valley and its tributaries. The Great Miami River, the Little Miami River, and the Mill Creek likewise contribute to this system of hillsides and valleys. No naturally happening lakes exist, however 3 significant manmade lakes are part of the Great Parks of Hamilton County.

The county limits consist of the least expensive point in Ohio, in Miami Township, where the Ohio River streams out of Ohio and into Indiana. This is the upper swimming pool elevation behind the Markland Dam, 455 feet (139 m) above sea level.

The highest land elevation in Hamilton County is the Rumpke Sanitary Landfill at 1,045 feet (319 m) above water level in Colerain Township.


Hamilton County has usually elected Republican candidates in national elections, but has actually trended Democratic over the last few years. In 2008, Barack Obama was the very first Democratic governmental candidate to win the county since 1964. The county continued to lean Democratic, choosing Obama once again in 2012 and for Democratic candidate Hillary Clinton in 2016. In fact, it was among the few counties in Ohio to swing toward the Democrats in 2016 even as the state as a whole had actually swung towards the Republicans. In the 2018 midterm elections, with the election of Democrat Stephanie Summerow Dumas, the Hamilton County Board of Commissioners was entirely under Democratic control for the first time ever.  They had previously restored a 2/3rds majority control of the Board of Commissioners in 2016 with the election of Denise Driehaus. In 2019, longtime Democratic Commissioner Todd Portune announced his resignation from the Board due to health problems. Portune’s Chief of Staff, Victoria Parks, was designated to serve the remainder of his term (through the November 2020 general election). With Parks’ consultation, the Board of Commissioners became for the first time all-female and bulk black.

Due to its tight races and its position in the swing state of Ohio, Hamilton County is related to as an essential county to win in governmental elections. In 2012, The Washington Post named Hamilton as one of the seven most crucial counties in the country for that year’s election.


2000 census

As of the 2000 census, there were 845,303 individuals, 346,790 homes, and 212,582 households living in the county. The racial makeup of the county was 69.2% White, 26.0% Black or African American, 0.1% Native American, 2.3% Asian, 0.01% Pacific Islander, 0.51% from other races, and 2.2% from two or more races.

There were 346,790 homes out of which 30.20% had kids under the age of 18 living with them, 43.40% were wed couples living together, 14.30% had a female householder with no hubby present, and 38.70% were non-families. 32.90% of all families were made up of people and 10.60% had someone living alone who was 65 years of age or older. The average household size was 2.38 and the average family size was 3.07.

Hamilton County property value, dollars per square foot-2011
In the county, the population was expanded with 25.80% under the age of 18, 9.60% from 18 to 24, 29.70% from 25 to 44, 21.50% from 45 to 64, and 13.50% who were 65 years of age or older. The mean age was 36 years. For every single 100 females there were 91.10 males. For every single 100 females age 18 and over, there were 86.80 males.

The median earnings for a family in the county was $40,964, and the median earnings for a family was $53,449. The per capita income for the county was $24,053.

2010 census

As of the 2010 United States Census, there were 802,374 people, 333,945 households, and 197,571 families living in the county. The racial makeup of the county was 68.8% white, 25.7% black or African American, 2.0% Asian, 0.2% American Indian, 0.1% Pacific islander, 1.1% from other races, and 2.1% from two or more races. In terms of origins, 31.0% were German, 14.7% were Irish, 7.7% were English, and 6.6% were American.

Of the 333,945 families, 29.7% had children under the age of 18 living with them, 39.4% were wed couples living together, 15.4% had a female homeowner with no spouse present, 40.8% were non-families, and 33.9% of all homes were made up of people. The mean age was 37.1 years.

The typical earnings for a home in the county was $48,234 and the mean income for a family was $64,683. Males had an average income of $48,344 versus $37,310 for females. The per capita income for the county was $28,799. About 11.1% of families and 15.4% of the population were below the poverty line, including 22.9% of those under age 18 and 9.0% of those age 65 or over.  Hamilton County animal control.

Hamilton County, OH Zip Codes

45002 | 45014 | 45030 | 45039 | 45051 | 45052 | 45069 | 45111 | 45140 | 45174 | 45202 | 45203 | 45204 | 45205 | 45206 | 45207 | 45208 | 45209 | 45211 | 45212 | 45213 | 45214 | 45215 | 45216 | 45217 | 45218 | 45219 | 45220 | 45223 | 45224 | 45225 | 45226 | 45227 | 45229 | 45230 | 45231 | 45232 | 45233 | 45234 | 45235 | 45236 | 45237 | 45238 | 45239 | 45240 | 45241 | 45242 | 45243 | 45244 | 45246 | 45247 | 45248 | 45249 | 45251 | 45252 | 45255


Call Now