Government Code section 23147

The boundaries of Siskiyou County are as follows:
Commencing on the northern line of the State of California at the northeast corner of Del Norte, being on the summit of a spur of the Siskiyou Range of mountains; thence southerly along the eastern line of Del Norte to the northern line of Humboldt; thence easterly and southerly along the northern and eastern line of Humboldt to the northwest corner of Trinity; thence along the northern boundary of Trinity to the northwest corner of Shasta at Castle Rock; thence due east to the range line between R. 4 and 5 E., M. D. B. & M.; thence north along said range line to the northern boundary of the State of California; thence due west along said state boundary line to the place of beginning.

Source: Section 23147, https://leginfo.­legislature.­ca.­gov/faces/codes_displaySection.­xhtml?lawCode=GOV§ionNum=23147.­ (updated Jan. 1, 1947; accessed Jun. 25, 2025).

Green check means up to date. Up to date

Verified:
Jun. 25, 2025

§ 23147's source at ca​.gov