Form an LLC in California with SunDoc Filings! 916-480-1225 We courier and file California LLC paperwork daily.To form a limited liability company (LLC), you must file Articles of Organization (Form LLC-1) with the California Secretary of State. Where to File: Completed forms along with the applicable fees can be mailed to Secretary of State, Business Entities. CorpNet makes it fast and easy for you to form an LLC in California. Enter the name of the LLC exactly as it appears on file with the California. 1500 11th Street, Sacramento, CA 95814. File forms with California Secretary of State.