In 2005, I wrote one of my first custom mapping projects using the recently released Google Maps API. It was a fairly crude map that used the Census Tiger ZCTA' s (Zip Code Tabulation Area) to display a representation of a Zip Code area. Matt Cutts, at the time, a major player at Google in search, wrote a blog post called "Fun with Zip Codes" that caused my site to get an average of 70,000 unique visitors a day for about a week. The traffic that Matt's blog post caused made me consider that there could be a market for this type of site so I looked deeper into the issue and learned a number of interesting things. The most important thing I learned was that Zip Codes are not areas. They are delivery routes. The USPS draws these delivery routes based on the efficient delivery of mail and nothing else. They can cross city, county and even state lines if it means the mail gets delivered efficiently. Not every address in the US has a Zip Code. This is not obvious for
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