Incumbents Dave Mandelkern, Patricia Miljanich and Karen Schwarz were each re-elected to three open seats, and raised a total of $65,030, according to the reports.
Of the three challengers — Joe Ross, Michael Stogner and Jaime Diaz — only Mr. Ross filed a report with the county Elections Office. That report showed contributions totaling $41,013.
The reports itemize campaign donations of $100 or more. Below is information on donations of $500 or more.
Ms. Miljanich raised $11,990, including loans. Two of her seven donors gave $500 or more: International Brotherhood of Electrical Workers Local 617 in San Mateo, $500; and the District Council of Iron Workers in Pinole, $500.
The report shows Ms. Miljanich receiving two loans of $3,128 each from her colleagues, one from Mr. Mandelkern's campaign and one from Ms. Schwarz's.
Ms. Schwarz raised $16,515. Two of the 12 donations were for $500 or more: the International Brotherhood of Electrical Workers Local 617 in San Mateo, $500; and the District Council of Iron Workers in Pinole, $500.
Mr. Mandelkern raised $36,515, including loans. Six of the 28 donations were for $500 or more: International Brotherhood of Electrical Workers Local 617 in San Mateo, $500; San Mateo County Firefighters Local 2400 in San Mateo, $500; Ken Varner of Colma, $500; John Goldman of Atherton, $500; the District Council of Ironworkers in Pinole, $500; and Mary Anne Rothberg of New York City, $500.
Mr. Mandelkern lent his campaign $25,000.
Of 30 donations to Mr. Ross' campaign, five were for $500 or more: Sandra Wrobel of Redwood City, $500; Steven Westly of Menlo Park, $550; Ira M. Lechner of Escondido, $500; Thomas Adams of Palo Alto, $1,500; and Ronald Turiello of Redwood City, $5,000.
Mr. Ross lent his campaig