There are district attorneys for each district of the United States. Please ask again, specifying the particular district.
United States Attorneys are the chief prosecutors for the states. They're also referred to as United States District Attorneys.
united states attorney
The United States Attorneys serve as the nation's principal litigators under the direction of the Attorney General.
In federal district courts, you mean... right? Assuming so... The United States Attorney's Office, which is overseen by the United States Department of Justice, which is headed-up by the United States Attorney General. SEE: http://www.usdoj.gov/usao/ Each federal judicial district (and there are 94 of them) has a "United States Attorney," and all the attorneys who work for him or her have the title "Deputy US Attorney." The actual person who appears in the the court room to represent the federal government is typically a Deputy US Attorney, though in a high profile case the US Attorney himself or herself may appear and try the case.
Federal trial courts are the United States District Courts.
United States District Court for the District of Columbia was created in 1863.
The head of the United States Department of Justice is the United States Attorney General. As of June 2014, Eric Holder is the Attorney General of the United States.
United States District Court for the District of Hawaii was created in 1900-06.
The federal district of the United States is Washington, D.C., which is also known as the District of Columbia.
United States District Court for the District of Alaska was created on 1958-07-07.
United States District Court for the District of Maine was created on 1820-03-30.
United States District Court for the District of Massachusetts was created on 1789-09-24.