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Find boundaries of ZIP Code for Lat/Long


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Hey gang,

Another fun question. We are recieving ZIP Code data from a partner but we need to translate this into latitude/longitude. I am running up against a wall on this one. Take a peek at the attached image. What we need to do is tell the code what zip code we are dealing with and then get the boundary lat/long values. I have spent the morning searching for anything on this... so far nothing.

Let's say for the sake of argument that what I need is language independent. (However we are using VB/VB.NET/C# so anything in that arena would be best.

ANY thoughts?

Thanks.

post-45653-1231869624_thumb.jpg

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From what I understand, boundaries constantly change on a regular basis, and as such would probably be costly to subscribe to a service that provides accurate data in real time. Do you need a set of lat/lon coords to form a poly for visual purposes?

Anyway, here are some services I am familiar with:

Proprietary services:

MelissaData

CCH (provides tax data, not sure if they do geocoding as well)

Free services:

Google Geocoding(be sure to throttle the requests if you want to run them in batch, otherwise they may cut you off for a while as they have a limit of 15,000 requests per day, or 1 every 6 seconds)

Yahoo is probably also free, never used them though.

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