Zip codes split between California Senate Districts Format: Zip Senate Percent Senate Percent Senate Percent Code District of zip District of zip District of zip with in with in with in highest Senate second Senate third Senate percent District highest District highest District of zip percent percent of zip of zip These conversions are derived from the registered voter files of the several California counties, and count refers to the number of registered voters who are in both a particular zip and Senate District. Percent is the percent of the zipcode in the Senate District, so if there are 1000 people in zipcode 91999, and 400 are in SD 95 and 600 are in SD 96, then 40% of the zip is in SD 95 and 600% of the zip is in SD 96. Zips with counts of less than one hundred state-wide are not reported due to the likelihood that these are typographical or reporting errors.