The Post Office *definitely* doesn't do that. Post office ZIP codes are defined by route, not area, and have significant outliers, particularly in areas served by multiple post offices and extremely rural areas. You might see three different zips and at least 3 zip+4's on a single block with USPS ZIPs. If you're trying to get areas, use Census ZIPs. They're nearly identical but I'm fairly certain the Census ZIPs are more consistently contiguous regions.
On Fri, Aug 30, 2013 at 5:12 PM, John F. Eldredge <[email protected]>wrote: > You may want to double-check with the Post Office, to find out whether > there is the possibility that there may legitimately be outliers in some > cases. I don't think the US Post Office guarantees that zip codes will > always define a single polygon with no outliers. > > > Clifford Snow <[email protected]> wrote: >> >> >> On Fri, Aug 30, 2013 at 2:13 PM, Eric Fischer <[email protected]> wrote: >> >>> Or if you just want the US zip code polygons and don't care if you get >>> them from OSM or somewhere else, you could just download the shapefile of >>> Census Zip Code Tabulation Areas from >>> http://www2.census.gov/geo/tiger/TIGER2013/ZCTA5/ >>> >> >> >> It's the OSM data I'm after. I'd like to do a test to make sure that >> there are no outliers. I would expect that I should be able to construct a >> polygon from zip codes. If not, then there it might mean an import problem. >> I'm going to try Mike's suggestion of increasing the timeout. I did >> increase it, but not as much as suggested. >> >> >> -- >> Clifford >> >> OpenStreetMap: Maps with a human touch >> >> ------------------------------ >> >> Talk-us mailing list >> [email protected] >> http://lists.openstreetmap.org/listinfo/talk-us >> >> > -- > John F. Eldredge -- [email protected] > "Darkness cannot drive out darkness: > only light can do that. Hate cannot drive out hate: only love can do > that." -- Dr. Martin Luther King, Jr. > > _______________________________________________ > Talk-us mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-us > >
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