There are no postal zip codes in Doha if that is what you mean, the number 974 you mention is the country international dialing code that's not a postal zip code.
If you are ordering something online and must insert a zip code into a drop down menu just put 0000, that usually works.
there is no postal code for QATAR
when you register somewher, I too faced this problem.
at last i found a magic figure,,,, fax number of a Salwa road office.....It works !!! ......haha
468 - - - - ( that 7 digit number workd for me )
zip codes are only in US and Canada, and it has nothing to do with any phone nos. you can easily put ur post no. that is the PObox of your personal or your company's PObox. it works easily...in much cases u can leave it blank.
zip code is to identify the address or location and the telephone country code is for the international dialling number.
qatar don't have zip code normally address or location is known thru there landmark and area, and for the international dialling number for qatar you must call 00974 + contact number.