Commas

Q. In our international magazine mailings, we always include the country name; however, we would like to know the correct procedure for including “USA” after the city/state/ZIP. Is there a comma after the ZIP code or not? Your assistance would greatly reduce the amount of tension/dissension among the writers and editor and proofreader.

Q. Can you help me out with a question? Do you use a comma after the abbreviation of the word incorporated? For example, in the sentence “Today, ABC Company, Inc., announced that their earnings have increased 50 percent in the past year,” we have been told to use a comma after the word “Inc.” when used in a sentence. This has caused an uproar within the company because we did not learn this rule. Help!