Code Finder allows you to quickly look up airport codes, area codes, country codes, and ZIP codes. Because it reads this information from data files built into Mac OS X, it does not require an internet connection.
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Folks, I'm sorry, but the comment spammers send about a million more comments than real readers do and I can't stand the spam. I've disabled comments again. Feel free to respond to @miraz on Twitter or to email me through the contact form on the site.