On November 8, 1988, Angela was elected to the San Francisco Board of Supervisors after placing second in a field of 24 candidates with over 95,000 votes. She was reelected in November 1992, placing first with nearly 150,000 votes and became Board President. Angela served as Board President from January 1993 to January 1995.
As President, Angela served as Vice-Chair of the Board's Finance Committee. After Angela's term as Board President expired, she served as the Chair of two Board Committees: the Health, Public Safety and Environment Committee and the Select Committee on Municipal Public Power, the committee she created as President. On January 8, 1997, Angela left the Board of Supervisors due to term limits. During her tenure on the Board, Angela fought the tobacco companies with several pieces of legislation, including the strongest anti-smoking ordinance in the United States.
She also focused on protecting neighborhood health care, created a comprehensive homeless plan, increased funding for AIDS services, wrote the City's needle exchange legislation, cosponsored the minority business laws, crimes legislation, protected workers rights, assured environmental protection, helped small business, and furthered efforts to municipalize the City's electrical utility system. Angela also created the San Francisco Film Commission and the San Francisco Youth Commission.
Below is Angela's legislative record while on the San Francisco Board of Supervisors: