Would be good to have also postal code available in the location part of segment editor. The reasons: - with postal code one can filter more narrow e.g. within large cities with more than one postal code - one can filter more wide in areas where several small places share one postal code - on could filter in steps if "begin with" is support e.g. 3, 38, 381...
It's provide from geo-ip provider maxmind.
(related to https://github.com/piwik/piwik/issues/9757)