California Code, Government Code - GOV § 84215

(a) Statewide elected officers, including members of the State Board of Equalization; Members of the Legislature; Supreme Court justices, court of appeal justices, and superior court judges; candidates for those offices and their controlled committees; committees formed or existing primarily to support or oppose these candidates, elected officers, justices and judges, or statewide measures, or the qualification of state ballot measures; and all state general purpose committees and filers not specified in subdivisions (b) to (e), inclusive, shall file a campaign report with the Secretary of State by online or electronic means, as specified in Section 84605.

(b) Elected officers in jurisdictions other than legislative districts, State Board of Equalization districts, or appellate court districts that contain parts of two or more counties, candidates for these offices, their controlled committees, and committees formed or existing primarily to support or oppose candidates or local measures to be voted upon in one of these jurisdictions shall file the original and, if the filing is in paper format, one copy with the elections official of the county with the largest number of registered voters in the jurisdiction.  Elected officers, candidates for these offices, and their controlled committees shall also file a copy of their campaign reports with the elections official of the county in which the elected officer or candidate is domiciled, as defined in subdivision (b) of Section 349 of the Elections Code.

(c) County elected officers, candidates for these offices, their controlled committees, committees formed or existing primarily to support or oppose candidates or local measures to be voted upon in any number of jurisdictions within one county, other than those specified in subdivision (d), and county general purpose committees shall file the original and, if the filing is in paper format, one copy with the elections official of the county.

(d) City elected officers, candidates for city office, their controlled committees, committees formed or existing primarily to support or oppose candidates or local measures to be voted upon in one city, and city general purpose committees shall file the original and, if the filing is in paper format, one copy with the clerk of the city.

(e) Elected members of the Board of Administration of the Public Employees' Retirement System, elected members of the Teachers' Retirement Board, candidates for these offices, their controlled committees, and committees formed or existing primarily to support or oppose these candidates or elected members shall file the original with the Secretary of State, and a copy shall be filed at the relevant board's office in Sacramento.

(f) Notwithstanding any other provision of this section, a committee, candidate, or elected officer is not required to file more than the original and one copy, or one copy, of a campaign report with any one county elections official or city clerk or with the Secretary of State.

(g) If a committee is required to file campaign reports required by Section 84200 or 84200.5 in places designated in subdivisions (a) to (d), inclusive, it shall continue to file these reports in those places, in addition to any other places required by this title, until the end of the calendar year.