Rules for ZIP Code 20899

ZIP code 20899 is governed by the city of Gaithersburg, MD, home to about 100% of the ZIP's residents. The ordinances shown below come from Gaithersburg'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.