{"data":{"id":"us-ca/gov-23107","jurisdiction":"us-ca","citation":"GOV § 23107","heading":"","body":"The boundaries of Contra Costa County are as follows:\nBeginning in the Bay of San Francisco at the northwest point of Red Rock, being the common corner of Marin, Contra Costa, and San Francisco; thence up the Straits and Bay of San Pablo, on the eastern boundary of Marin, to the point of intersection with a line bearing south 261/2 degrees E., and about six and one-quarter miles distant from the southwest corner of Napa, forming the common corner of Marin, Solano, Sonoma, and Contra Costa; thence to the Straits of Carquinez; thence up said straits and Suisun Bay, to the mouth of the San Joaquin River; thence up said river, to the confluence of the west and main channels thereof, as laid down on Gibbe’s map; thence up the said west channel, to a point about 10 miles below Moore and Rhodes’ ranch, at a bend where the said west channel, running downward, takes a general course north, the point being on the westerly line of San Joaquin, and forming the northeast corner of Alameda and southeast corner of Contra Costa; thence westerly on the northern line of Alameda to the easterly line of San Francisco; thence due northwest, along said easterly line of San Francisco, four and one-half miles, more or less, to the place of beginning.","path":["Government Code - GOV","TITLE 3. GOVERNMENT OF COUNTIES [23000. - 33205.]","DIVISION 1. COUNTIES GENERALLY [23000. - 23732.]","CHAPTER 2. Boundaries [23070. - 23296.]","ARTICLE 2. Boundaries of the Several Counties [23100. - 23158.]"],"source_url":"https://downloads.leginfo.legislature.ca.gov/pubinfo_2025.zip","current_through":"2026-09-13","vintage":"","retrieved_at":"2026-09-14T05:56:33Z","sha256":"a9ca6300e160673aaaec2ef4095b2e1489cdd3a2f62df40b10fd68aa6c5cd3ee","source_id":"us-ca","stale":false,"prev":"us-ca/gov-23106","next":"us-ca/gov-23108"},"notice":"GroundRules: Original legal text. Not legal advice."}