Rules for ZIP Code 94503
American Canyon, CA · Napa County
ZIP 94503 is governed by the city of American Canyon, CA. We do not hold its code yet, and Napa County ordinances do not apply inside its limits.
ZIP code 94503 lies in the city of American Canyon, CA, which holds about 95% of the ZIP's residents and writes its own local code. We have not added American Canyon's ordinances yet, so nothing is shown below: Napa County rules govern only unincorporated land and do not reach inside American Canyon.
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.
American Canyon is not covered yet
The city of American Canyon writes its own code; the county's rules do not apply inside it.Request American Canyon coverage →
← Search another location