Your MasterCard credit card should not have your Zip Code anywhere on it, in human-readable form.
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5445
The answer is yes It's with BMO Bank
Normally if mailing with the USPS it is now .45 cents (you can purchase Forever Stamps which will be good forever even with a postal rate increase) as long as it is not overweight or bigger than the average size office envelope. A standard rate stamp (.45) will take a letter anywhere in the continental US, regardless of the zip code. (keeping in mind the size and weight)
On the back of the card, the last 3 digits on the signature bar
MasterCard numbers always start with the number 5.