Rules for ZIP Code 94509

ZIP code 94509 is governed by the city of Antioch, CA, home to about 96% of the ZIP's residents. The ordinances shown below come from Antioch's own code and apply to residential and commercial properties within its limits, from noise restrictions and parking to building permits and animal regulations.

Each topic below links to the full ordinance breakdown with specific code sections, fine amounts, and answers to common questions. The data is sourced from the official municipal code and verified by our editorial team.