[OSM-newbies] Zip codes

[Clay Smalley]

To elaborate a little - ZIP code boundaries seem to be drawn according to
whatever is convenient for mail delivery routes.

For example: http://www.unitedstateszipcodes.org/90010/ (you may have to
zoom in once or twice to see it)

Check out 90005 and 90010. Individual addresses on either side of Wilshire
Boulevard seem to be arbitrarily assigned a ZIP code. And on top of that,
ZIP codes change a lot. And there are tens of thousands of them. So it's
hard to get accurate information out of such a huge, non-static dataset.


On Sun, Apr 27, 2014 at 6:55 PM, Richard Welty <rwelty at averillpark.net>wrote:

>  On 4/27/14 5:13 PM, John Chambers wrote:
>
>   There is a "note" in my area that says:
> Unresolved note #145813
> Description
>
> bounds: (33.8871,-84.0902 - 33.8791,-84.0693)
>
> http://www.openstreetmap.org/?box=yes&notes=yes&bbox=-84.0902%2C33.8791%2C-84.0693%2C33.8871
> Map is showing wrong data here. 30044 is not Duluth, GA. This zip code
> should pull up Lawrenceville, GA
>  Created by anonymous 22 days ago
>
>
>  I see where the streets are tagged with zip 30044, but have no Idea where
> that might be associated with Duluth, GA.  Is this something in the map
> data, or is it a rendering problem, or is this note just garbage?  I'm
> confused.
>
> zip codes are a difficult problem. what came in from TIGER is
> a Census Bureau approximation of zip code data and not the
> real thing.
>
> the note may or may not be correct. zip codes do not line up
> in strict conformance with admin boundaries, and they have been
> known to jump county and even state lines.
>
> individual cases are basically research problems.
>
> richard
>
> -- rwelty at averillpark.net
>  Averill Park Networking - GIS & IT Consulting
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>
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