On 5/1/15 11:47 AM, [email protected] wrote: > Richard, > > Great point about administrative boundaries and ZIP code boundaries. > It'd be really interesting to see the evolution of ZIP codes over the > decades. > > Has anyone seen visualizations of ZIP changes previously? Or know > whether there are historical datasets of ZIP boundaries? > the USPS has historically held zip code data closely as it's a profit center; they sell it to shippers under fairly restrictive terms of service. additionally, they maintain it as a set of routes, not as a set of polygons; there are reasons why a poly representation of the data can only be approximate.
the Census Bureau has their ZCTA data set, which is a polygonal approximation of zip code data that they use for various statistical exercises. but it only goes back as far as the TIGER effort goes, so far as i know. or at least, any pre-TIGER data isn't readily available. ZCTA is public domain and available in various formats on the TIGER download site. richard -- [email protected] Averill Park Networking - GIS & IT Consulting OpenStreetMap - PostgreSQL - Linux Java - Web Applications - Search
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