Zip Code 
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.
Zoo
To dream that you are visiting a zoo indicates a loss of your freedom. It further symbolizes that your talents and abilities have gone unnoticed. You may feel that you or an aspect of yourself is caged in.
Conversely, a zoo may indicate confusion or chaos in your life. This feeling is exemplified by the saying 'this place is a zoo!' Consider what aspects of your life may need to be straightened out.
Zoological Garden
To dream that you are visiting a zoological garden means you should look to succeed at a business venture by adhering to your ethics.