Ohio is located in the Northern and Western Hemispheres. Specifically, it is situated in the northern part of North America, above the equator, which places it in the Northern Hemisphere. Additionally, Ohio is to the west of the Prime Meridian, which categorizes it as being in the Western Hemisphere as well.
This positioning is typical of many states in the United States, which is primarily located in the Northern Hemisphere. To provide further context, the Northern Hemisphere includes countries and regions like Canada, most of Europe, and parts of Asia, all of which share similar geographical features and climate patterns with Ohio.