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 <[email protected]>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¬es=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 > > -- [email protected] > Averill Park Networking - GIS & IT Consulting > OpenStreetMap - PostgreSQL - Linux > Java - Web Applications - Search > > > _______________________________________________ > newbies mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/newbies > >
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