To find your California State Assembly district by ZIP code, use the Legislature’s official lookup tool at findyourrep.legislature.ca.gov and enter your full street address, because a ZIP code on its own often covers more than one Assembly district and won’t give you a reliable answer. The tool returns your Assembly Member’s name, district number, and contact information in under a minute.
Using the State’s Address Lookup Tool
The California State Legislature maintains a free lookup at findyourrep.legislature.ca.gov that maps your home address to the current legally defined district boundaries. You’ll need your complete street address, city, and ZIP code for an accurate match.
Type your residential address into the search fields and submit. The system checks your location against the current district map and displays your Assembly district number, your Assembly Member’s name, and usually your State Senator as well. From there you can click through to your Assembly Member’s official page for phone numbers, committee assignments, and recent legislation.
The tool includes a disclaimer worth reading: for official confirmation of your district, contact your local county registrar or elections department.1California State Legislature. Find Your California Representatives County elections offices maintain the authoritative voter files tied to district assignments, so if you’ve recently moved or live near a district boundary, a call to your county registrar can settle it.
Why ZIP Codes Alone Won’t Work
ZIP codes exist to organize mail delivery, not to track political boundaries. A single ZIP code can sprawl across portions of multiple Assembly districts, especially in cities and suburbs where district lines follow streets, creeks, or property boundaries that have nothing to do with postal routes.
The California Senate Office of Demographics publishes data showing exactly how ZIP codes split across districts. ZIP code 95602 in Auburn sits partly in Assembly District 1 (about 31% of the population) and partly in District 5 (about 69%). ZIP code 95223 in Arnold splits between District 1 and District 8.2Senate Office of Demographics. 2025 State Assembly Zip Codes These aren’t rare edge cases. Hundreds of California ZIP codes cross district lines, which is why the Legislature’s lookup tool asks for a full street address.
If you want the full ZIP-to-district breakdown, that Senate Office of Demographics document lists every California ZIP code in Assembly district order and shows the population share when a ZIP falls in more than one district.
Confirming Your District Another Way
If the online tool doesn’t work for your address, or you’d rather talk to a person, the California Secretary of State maintains a directory of all 58 county elections offices at sos.ca.gov. Your county registrar can confirm your Assembly district by phone or in person. This is especially useful for new construction or any address that’s hard to geocode.
You can also go directly to your Assembly Member’s individual page on assembly.ca.gov, which lists Capitol and district office contact information.3California State Assembly. Members If you already know your district number but not your representative, the full member directory covers all 80 districts.
What to Do Once You Know Your District
Every Assembly Member maintains two offices: a Capitol office in Sacramento for legislative work, and at least one district office within the area they represent.3California State Assembly. Members For constituent help, the district office is usually the right starting point.
District office staff handle a wide range of problems involving state agencies. They can intervene on your behalf with the Department of Motor Vehicles, help resolve state tax issues with the Franchise Tax Board, assist with unemployment or disability insurance claims through EDD, navigate Medi-Cal enrollment or Covered California, address professional licensing complaints, and connect you with foreclosure prevention programs or veterans’ benefits. They also refer constituents to community resources for housing, food assistance, legal help, and mental health services.
Most people underestimate this. If you’re stuck in a bureaucratic loop with a state agency and phone calls aren’t getting anywhere, a casework request through your district office carries real weight. Call or email, explain the issue, and staff will typically ask permission to contact the agency on your behalf.
Following Bills in Your District
Knowing your district also lets you track and weigh in on legislation. The California Legislature’s bill search at leginfo.legislature.ca.gov looks up any bill by number, keyword, author, or session year, including the current 2025–2026 session.4California Legislative Information. Bill Search
Assembly committee hearings are open to the public, and you can testify in person. The committee chair controls how testimony is managed and may limit speakers or time when agendas are heavy, but supporters and opponents receive equal time. If you can’t attend, you can submit a written position through the Legislature’s Advocacy Portal. Written positions must reach the committee by noon on the Tuesday before a scheduled hearing to be referenced in the committee’s analysis.5Assembly California Process. 2025-2026 Committee Rules
A Quick Note on District Size
The California State Assembly has 80 members, each representing a single district. Based on the 2020 Census, California’s roughly 39.5 million residents divide into districts of approximately 494,000 people each, one of the highest constituent-to-representative ratios of any state legislature in the country. That size is part of why ZIP codes and district lines don’t align cleanly: a district covering half a million people rarely follows postal geography.