Cal. Elec. Code § 2185

Upon written demand of the chair or vice chair of a party state central committee or of the chair of a party county central committee, the county elections official shall furnish to each committee, without charge therefor, the index of registration for the primary and general elections, for any special election at which a partisan office is to be filled, or for any statewide special election. The index of registration shall be furnished to the committee demanding the index not less than 25 days prior to the day of the primary, general, or special election for which they are provided. Upon written demand, the county elections official shall also furnish to the committee the index of registration of voters who registered after the 54th day before the election, which shall be compiled and prepared by Assembly districts. The county elections official shall furnish either two printed copies or, if available, one copy in an electronic form of the indexes specified in this section.