California Code, Elections Code - ELEC § 2187

(1) The total number of voters in the county.

(2) The number registered as preferring each qualified political party.

(3) The number registered as preferring nonqualified parties.

(4) The number registered without choosing a political party preference.

(5) The number of voters by political party preferences in each of the following political subdivisions, located in whole or in part within the county:

(1) On the 135th day before each presidential primary and before each direct primary, with respect to all voters who are registered voters on the 154th day before the primary election.

(2) Not less than 50 days before the primary election, with respect to all voters who are registered voters on the 60th day before the primary election.

(3) Not less than seven days before the primary election, with respect to all voters who are registered voters on the 15th day before the primary election.

(4) Not less than 102 days before each presidential general election, with respect to all voters who are registered voters on the 123rd day before the presidential general election.

(5) Not less than 50 days before the general election, with respect to all voters who are registered voters on the 60th day before the general election.

(6) Not less than seven days before the general election, with respect to all voters who are registered voters on the 15th day before the general election.

(7) On or before March 1 of each odd-numbered year, with respect to all voters who are registered voters on February 10.