Some additional repos to consider:
SilverStripe-Regional — Using modern GeoIP lookup mechanisms, this SilverStripe module makes available the coordinates, postal code, city, state, country, content, timezone, organization, and ISP to the SilverStripe instance and can open a frontend API for static websites to take advantage of. It can be extended with GeoIP drivers to provide additional or custom contextual data.
zipcodes.js — Free postal code validation & lookup for the web.
pk-postal-codes — Postal code data collection
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