From the U.S. Census:
In advance of the Iowa caucuses on Feb. 1, the Census Bureau presents a variety of statistics that give an overall profile of each state’s voting-age population and industries.
· Selected economic characteristics, including median household income and poverty.
· Selected social characteristics, including educational attainment.
· County Business Patterns (providing information on employment by specific industries).
· Statistics on voting and registration.
Note: A PDF version of the graphic is also available.