I am looking at a map of LA ZIP code 90059. It shows that 90059 includes all or part of 13 census tracts and 10 of those tracts are partially in at least 1 adjacent ZIP code. Furthermore, one of those tracts, 2408 is in ZIP codes 90059 and 90061 and 90002 and 90003. You can identify what tracts are in which ZIP codes and which ZIP codes are in which tracts, but almost always there are multiple relationships like I just noted in 1 tract in LA. If you are interested I would be happy to e-mail you a pdf copy of the map I am talking about to help you understand the problem. What is the purpose of your project? If I understand what you are trying to accomplish, perhaps I can make a suggestion that would be helpful. I am sorry that I can't comment on CRA Wiz, but the relationship I explained holds true no matter what software you are using. If you want the sample map just pm me. I won't be able to send you the map until Monday because I will be out of my office the remainder of the week. Hope this helps
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