• United Steelworkers Of America
  1820 Galindo St # 240
• Northern California Pipe
  1855 Gateway Blvd
• Contra Costa Schools Education
  
• California School Employees
  2345 Stanwell Cir
• Automotive Machinists Union
  1900 Bates Ave # H
• Plumbers Steamfitters Refrig
  935 Detroit Ave
• Joint Apprenticeship & Trng
  935 Detroit Ave
• Communications Workers-America
  3629 Clayton Rd
• California Teachers Assn
  2177 Diamond Blvd
• Ca Teachers Assn Alcosta Svc
  2177 Diamond Blvd