How difficult would it be to match the cities in the table CityByCountry with international zip codes, or at least US zip codes? I wrote a script that would match a city code to a city name/zipcode from the list in the BSD ports collection, I was able to match 4,433 records with zip codes but I'm missing about 400 for code 226 (US). How difficult would this be to make it a part of the data collection? I've written some Perl SOAP services based on this if anyone is interested.
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