Sources covering the entire United States
Write Your Representative. Identifies Members of the United States House of Representatives by Zip Codes within their districts.
Sources covering California only
Statewide Database ZIP Code Reports (University of California Berkeley, Institute of Governmental Studies). Election related studies.
Your Legislature. Identifies Members of the California Legislature by Zip Codes within their districts.
Sources covering Los Angeles
City of Los Angeles: Election Information
Los Angeles County Registrar's Office. Voting Information including how to register to vote, official voter pamphlets and results from past elections.