Blanca was elected to the Board of Supervisors in March 1996, after completing Zoe Lofgren’s unexpired term. In January 1998, Blanca served as the first Latina Chairperson in the County’s history. Blanca was re-elected for her third and final term in March, 2004. As the County Supervisor for the Second District, Blanca represented over 350,000 residents living in San Jose. Blanca Alvarado spearheaded the county's years long juvenile detention reform efforts.