Formed January 2, 1790 (2nd county)
Hamilton County (830,625), Cincinnati (309,561)
The Renaissance Revival masonry facility was built in 1918. There was also an 1885 courthouse in Cincinnati, the only county seat. The facility is at Main, Court, Sycamore, and Central streets. United States Highway 22 is two blocks north of the building. Charles Howard Crane is the building designer. A County Justice Center was added in 1985. The county was organized on January 2, 1790 as the 2nd county. Hamilton County is named for United States Secretary of the Treasury Alexander Hamilton. He is also the namesake of the county seat of Butler County. The county seat is named for the Roman General Cincinnatus. Hamilton County is the birthplace of 3 Ohio Governors, William Dennison, Jr., Judson Harmon, and John J. Gilligan. Benjamin Harrison, the 23rd President, was born in this county. William H. Taft, the 26th President, was born in this county.
Hamilton County government consists of an auditor, a sheriff, an attorney, and a coroner (executive). It has 3 Commissioners (legislative.) Twenty-one Common Pleas Court Judges and a court clerk serve Hamilton County (judicial.) The county is in the southwest corner of the state. It borders both Indiana and Kentucky. The Ohio River forms its southern border. Dayton, Ohio is north and Columbus, Ohio is northeast of the county. The county center is 10.9 miles North-Northwest of Cincinnati nearer Northbrook. The county is surrounded clockwise by Butler, Warren, and Clermont counties and Kentucky and Indiana.
The area of the county is 407.4 square miles. It is 69 out of 88 in the state. It ranks 3 out of 88 in population in the state. It has a density of 2038.8 persons per square mile making it 3 out of 88 in the state. Hamilton County has 64.8% of its population in its incorporated areas. Interstate Highway 71 enters the county from the northeast, Warren County, and exits to the south, Kentucky. Interstate Highway 74 originates and heads west into Indiana. Interstate Highway 75 crosses north to south from Butler County to Kentucky. United States Highway 22 comes from Warren County, north, and terminates. United States Highway 27 travels from the north, Butler County, to the south, Kentucky. United States Highway 42 parallels Interstate Highway 71 from Warren County to Kentucky. United States Highway 52 enters from Clermont County, east, and joins Interstate Highway 74 into Indiana. United States Highway 127 comes from the north, Butler County, and goes to the south, Kentucky. William Henry Harrison, the 9th President, is buried in this county. The county could be described as a small letter r lying on its face with a fat stomach. Cincinnati dominates the southern border of the county. Cincinnati is the county seat and the largest city. It is 37.3% of the county population. The county seat is pronounced SIN-SIN-NA-TEE. This county is in the Cincinnati-Middletown Metropolitan Statistical Area.
Addyston
Amberley
Arlington Heights
Blue Ash
Cheviot
Cincinnati
Cleves
Deer Park
Elmwood Place
Evendale
Fairfax
Forest Park
Glendale
Golf Manor
Greenhills
Harrison
Lincoln Heights
Lockland
Madeira
Mariemont
Montgomery
Mount Healthy
Newtown
North Bend
North College Hill
Norwood
Reading
St Bernard
Silverton
Springdale
Terrace Park
The Village of Indian Hill
Woodlawn
Wyoming
Fairfield
Loveland
Milford
Sharonville