Rules for ZIP Code 08540
Princeton, NJ · Mercer County
ZIP 08540 is governed by the city of Princeton, NJ. We do not hold its code yet, and Mercer County ordinances do not apply inside its limits.
ZIP code 08540 lies in the city of Princeton, NJ, which holds about 41% of the ZIP's residents and writes its own local code. We have not added Princeton's ordinances yet, so nothing is shown below: Mercer County rules govern only unincorporated land and do not reach inside Princeton.
ZIP codes do not follow city lines. 08540 also covers:
- Franklin Township~20% of residents · not covered yet
- Lawrence Township~11% of residents · not covered yet
- West Windsor Township~10% of residents · not covered yet
Shares are estimates from 2020 Census geography. If your address is in one of these, its rules apply instead.
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.
Princeton is not covered yet
The city of Princeton writes its own code; the county's rules do not apply inside it.Request Princeton coverage →
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