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Jun 23, 2016 at 13:31 comment added winwaed Census Bureau link is broken. It probably referred to ZCTAs which are a census bureau invention. Originally based on zipcodes (which are NOT polygons and regularly change) these are polygons that are intended to be fairly constant. Ie. making them more usable for demographic purposes.
Jun 22, 2012 at 20:21 vote accept user9292
Jun 22, 2012 at 17:59 history answered MappingTomorrow CC BY-SA 3.0