The zip code system is designed to catalog and organize an enormous amount of data.
If a dream features this as a prominent image, the need to codify your sense of direction or bring clarity to otherwise chaotic thoughts is being highlighted.
The expansion of digital communication is slowly making snail mail all but obsolete, so such a dream may harken back to old ways of establishing boundaries.
To dream of zip codes suggests that you are not connecting with messages that are trying to get through to you. This is due to stress. This also suggests that you may need to start a meditation routine.
Dreaming of a specific zip code implies an urgent request from your unconscious to calm your mind and mental state.
Address, identity, grounding; location or bearings. Add numbers to get meaning.
Bringing attention to the relevance of that particular area