ZipCodes do not have spaces
Oh dear !
For someone who lists their location as "Mexico", I thought there may be a slight appreciation that there is a world out there outside of the Americas ! You sound just like one of those many americans who's never been outside the USA in their life. Please do not make sweeping generalisations like you did unless you are 110% sure of the facts !
There are a number of countries in the world that
DO have spaces and letters in their codes.... one of which is even not too far from you ... Canada !
Using alphanumeric postcodes permits a greater number of permutations, whilst retaining a short sequence and making it easier to memorise.