The best replacement for zip codes is postal codes.

The best alternatives to zip codes are rated as following:
★★★★★  postal codes
★  area codes
  census tracts

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Speaking about zip codes, one probably shouldn't forget about map.

Other search terms related to zip codes and their ratings are:
★★★★★ map
★★ counties
★★ letters
★ area codes
★ multiple counties
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maps
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