 Its name is in honor of the sixth President of the United States, John Quincy Adams.According to the U.S. Census Bureau, the county has a total area of , of which is land and (1.9%) is water.In recent years, average temperatures in the county seat of Quincy have ranged from a low of in January to a high of in July, although a record low of was recorded in January 1979 and a record high of was recorded in July 2005.