There was a thread that touched on this a while back
(http://www.mail-archive.com/talk-us@openstreetmap.org/msg03117.html),
and I'll repeat what I said then: I don't think you can say "usually"
with the Census data.  You really need to look at it on a
state-by-state basis.  While in some states CDPs seem to be pretty
arbitrary, in MN they follow municipal boundaries and are updated
yearly.  There must be other states where this is the case, too--I
can't imagine we're that far above average!

Cheers,
Brad

On Thu, Jun 10, 2010 at 10:37 AM, Nathan Edgars II <nerou...@gmail.com> wrote:
> Usually a CDP is simply an arbitrary area drawn by the Census Bureau
> for statistical purposes. Does it sound reasonable that these should
> at least not be treated as ordinary boundaries, if not (carefully)
> deleted altogether where not based on actual administrative
> boundaries?
>
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