🏛️

Contra Costa County Assessor

State Agency

Contact Information

  • 📍 2530 Arnold Drive Suite 100, Martinez 94553
  • 📞 (925) 313-7400
  • 🕒 Mon-Fri 8am-5pm PT
  • ⏱ Appeal Deadline: 30 days

Take Action

File Appeal Online → Visit Official Website → Browse Dispute Categories →