[Talk-us] CDPs and admin_level

Greg Troxel gdt at ir.bbn.com
Mon Oct 12 14:06:31 BST 2009

  Census-Designated Places are geographical units determined by the
  Census Bureau to give (arbitrary) limits to otherwise-unquantifiable,
  informal population centers.  They do not represent any real
  political, governmental, or administrative unit.  There are no signs
  posted to mark the borders of a CDP.  Residents of a CDP usually are
  not even aware of its existence, though they are certainly aware of
  the informal population center it's meant to represent.  They really
  have minimal real-world significance.

Should the various admin_level boundaries expect to be a hierarchy?  I
would think that no city is split into two countries.  In the US where a
what-people-think-of-as-city is split into two states, I think all cases
hvae separate cities on the sides of the state line.

Why is CDP different from UPS delivery zone, or zip code, or any other
division by some other entity?

Maybe CDP shouldn't be the same kind of political boundary tag and
instead something else, like us_census_boundary and then be related to
PMSA, SMSA, etc.
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