Government Code › TITLE 3. GOVERNMENT OF COUNTIES › DIVISION 1. COUNTIES GENERALLY › CHAPTER 4. County Seats › ARTICLE 1. Location of County SeatsGovernment Code § 23649‹ § 23648§ 23650 ›Copy linkOpen in browserleginfo ↗23649.The county seat of Sonoma is Santa Rosa.(Added by Stats. 1947, Ch. 424.)