"Each United States Attorney's Office deals with a wide variety of cases and handles a mixture of simple and complex litigation. In addition, each United States Attorney exercises wide discretion in the use of his/her resources to assist state and local jurisdictions and to meet the needs of local communities. This report captures the results of the United States Attorneys' efforts during Fiscal Year 2013, and presents both national and district caseload data in statistical tables and charts."
Executive Office for U.S. Attorneys: http://www.justice.gov/usao/