This is the web site for the EPA dealing with the registration. Although there are different types of information on pesticides here, the majority of the web site deals with registration of pesticides and the laws and regulations behind the registration process. Annual Use Maps . Pesticide National Synthesis Project, U.S. Geological Survey. Maps of the useage of a very wide array of pesticides.
Maps are to county level.
National Totals of Pesticide Use . Pesticide National Synthesis Project, U.S. Geological Survey. Tables of the pesticide useage by crop type for the United States. Pesticide Programs Site Locator . A very large compendium of links to web sites dealing directly or indirectly with pesticides.