Government Code › TITLE 3. GOVERNMENT OF COUNTIES › DIVISION 1. COUNTIES GENERALLY › CHAPTER 4. County Seats › ARTICLE 1. Location of County SeatsGovernment Code § 23646‹ § 23645§ 23647 ›Copy linkOpen in browserleginfo ↗23646.The county seat of Sierra is Downieville.(Added by Stats. 1947, Ch. 424.)