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Not Always. When looking at postal codes around the world, there are cases where two different cities are served by the same postal code. For example, the zip code 94608 in California is used for both Emeryville and parts of Oakland. One postal code, two cities.

Yes. In theory, postal code boundaries and time zone boundaries are separate entities, and thus their can be oddities like one postal code with multiple time zones. It is possible. However, it is hard to find real-world examples.

Some ZIP codes will span multiple states in order to make mail routing and delivery more efficient. In most cases, addresses in close proximity to each other are grouped in the same ZIP code which gives the appearance that ZIP codes are defined by a clear geographic boundary.

The Postal Service designates one preferred place name for each ZIP Code. This may be an incorporated town or city, a subentity of a large city or an unincorporated census-designated place, or a small unincorporated community. Additional place names may be recognized as acceptable for a certain ZIP Code.

Yes Units in apartment buildings have the same street address with the same zip codes. The unit number may be different but the street address is the same.

Each State can have many zip codes, but each zip code should have only one state.

There are no duplicate ZIP Codes. There are some ZIP Codes that are multi-part polygons, but those polygons are usually adjacent.

Although most ZIP Codes can be roughly assigned to a geographic area, ZIP Codes do not represent geographic regions. ZIP Codes denote street address groups or delivery routes. Because of this, ZIP Code "areas" can overlap, be contained within another ZIP Code, or have no geographic area.