About Hamilton, Ohio. Located on the Great Miami River in the heart of the Cincinnati-Dayton metroplex, Hamilton stands as the 10th largest city in the state. With a rich history and a commitment to progress, Hamilton is home to approximately 63,000 residents who contribute to the city's vibrant and diverse community. The City of Hamilton is the only municipality in Ohio to own and operate all four major utilities: electric, gas, water, and wastewater. The City prides itself on having more than 50% of its power generated by renewable resources. Hamilton has garnered numerous accolades, both on a national and international level, in recognition of its exceptional water taste and quality. Being the County Seat of Butler County, Hamilton is the area center for government, finance, and industry. For more information, please visit www.hamilton-oh.gov.