Government Code › TITLE 3. GOVERNMENT OF COUNTIES › DIVISION 1. COUNTIES GENERALLY › CHAPTER 4. County Seats › ARTICLE 1. Location of County SeatsGovernment Code § 23607‹ § 23606§ 23608 ›Copy linkOpen in browserleginfo ↗23607.The county seat of Contra Costa is Martinez.(Added by Stats. 1947, Ch. 424.)