Does anyone know of an existing (SAS or other) 3-digit zip code (zcta) data set? If not, what steps are needed to convert a 5-digit zip code data set to a 3-digit data set? (NOTE: I have the TigerLine 2013 US ZCTA510 data.) I believe it must be more than creating a new variable (3-digit zip code) from the existing 5-digit zip code. Many thanks, Gary
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