A county attorney in many areas of the United States is the chief legal officer for a county or local judicial district. It is usually an elected position. The role of the county attorney can be similar to or complementary to that of a local state's attorney, commonwealth's attorney or district attorney.
In some jurisdictions, the county attorney oversees the operations of local prosecutors with respect to violations of county ordinances. In other jurisdictions, the county attorney prosecutes traffic matters and/or misdemeanors. In some states the county attorney prosecutes violations of state laws to the extent that the state permits local prosecution of these. County attorneys do not prosecute federal crimes, which are the jurisdiction of a United States Attorney.
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In the United States, a district attorney (DA) is the chief prosecutor for a local government area, typically a county. The exact name of the office varies by state.
Except in the smallest counties, a district attorney leads a staff of prosecutors, who are most commonly known as deputy district attorneys (DDAs). The Deputy who serves as the supervisor of the office is often called the Assistant District Attorney. The majority of prosecutions will be delegated to DDAs, with the district attorney prosecuting the most important cases and having overall responsibility for their agency and its work. Depending upon the system in place, DAs may be appointed by the chief executive of the jurisdiction or elected by local voters.