The Chang Law Firm Google Map 535 Main St #3, Martinez, CA 94553 The Chang Law Firm info Address: 535 Main St #3, Martinez, CA 94553 Website: Telephone: (925) 370-1700 Zipcode: 94553 City: Martinez State: California Work Time: Thursday 9AM–5PM,Friday 9AM–5PM,Saturday Closed,Sunday Closed,Monday 9AM–5PM,Tuesday 9AM–5PM,Wednesday 9AM–5PM