On Wed, 1 Mar 2017 12:56:23 -0800
Jean Aurambault <jean.auramba...@gmail.com> wrote:

> I'm wondering if there is any standard that defines a universal city
> id (similar to country codes).

ISO 3166-2 defines codes for some cities, but its uneven.  However,
what's a city? Does Constantinople exist?

Richard.

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