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Ravi, what sort of volume are we talking? Can you post a spreadsheet with just your country/state/city/zipcode columns? [No need to include any data.] I suspect there's a free web utility out there that can take your zipcodes and generate some lat/longs for you. Then you can bring these into Tableau with your data. If you're only talking about a few multiples in a city, you can create a calculated field that adds degrees of lat/long based on another field. Tedious, but it works.
Up to 50/city. I think having a pie chart that can be zoomed in and reflects firm data works for now.