Ohio, a state in the USA. Considered a political bellwether due to the fact that it is not only the "most average" state in the Union, but Ohio's culture, economy, and social setup reflect the averages for the US as a whole. Some parts of the state are poor (inner city Cleveland, rural Appalachia), and some are rich (Suburbs, Cincinnati, Columbus), and the companies with headquarters or major operations there can be used as means of measuring the national economy, such as Proctor&Gamble, which makes consumer products, or Kroger, which is a HUGE supermarket chain.
I'd say more, but it would take a long, long time. My uncle is somewhere in Ohio right now. I wish I knew exactly where. Last I heard it was in Cleveland.