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As mentioned earlier, there are a few ZIP Codes that deliver across state lines, and there are a few ZIP/sectors that cross county lines. There are 153 ZIP Codes in more than one state. There are 9,000 ZIP Codes in more than one county. There were 11,331 (out of the total 857,400) ZIP/sectors that were split by county.

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.

ZIP codes don't usually cross state lines, but some do (65733, 71749, and 73949 are good examples). The complete list of ZIP codes that cross state lines is available as part of our US ZIP code list.

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.

ZIP codes can and do cross state lines (rarely, but just enough to cause some problems and confusion), county lines (about 10% of ZIPs are in more than one county), political jurisdictions (cities, congressional districts), metro areas, etc.

Ordinarily a zip3 fits within one state, but not always. Five digit zip codes are each entirely contained within a state as far as I know [1]. But three-digit zip codes can straddle state lines. For example, about 200,000 people live in the three-digit zip code 834.

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.