Narrowing down Zip Codes

[David Evans]

Happy Sunday! I'm struggling to further narrow down markets by Zip Codes and I was wondering if anyone had any efficient methods to sort them out. Here's my Problem:

I've narrowed down my markets to approximately 50 ZipCodes so far using simple supply and demand. I'm looking to narrow them down further to about 5-10 Zip codes. What would be the best method of achieving this goal? I've considered using data through city-data.com but I was hoping some one would have a more efficient solution.

Thank you in advance for any input!