The Government of the District of Columbia operates under Article One of the United States Constitution and the District of Columbia Home Rule Act, which devolves certain powers of the United States Congress to the Mayor and thirteen-member Council.
The Mayor of the District of Columbia is the head of the executive branch, overseeing 21 Departments, 33 independent agencies, roughly 69 legislatively mandated offices and 5 regional bodies. These include all city services, public property, police and fire protection, District of Columbia Public Schools, The University of the District of Columbia (UDC) and UDC-Community College. The mayor's office oversees an annual city budget of roughly $8.8 billion. http://dc.gov/directory