 Putnam County lost over two-thirds of its population between the years 1900 and 2000 (see census data below), when the United States changed from a rural to an urban country.According to the U.S. Census Bureau, the county has a total area of , of which is land and (0.4%) is water.As of the census of 2010, there were 4,979 people, 2,228 households, and 1,517 families residing in the county.