apmuthu
commented
5 years ago - https://www.vikasrana.com/Blog/219/List-of-country-state-city-with-postal-code-in-MS-SQL-Databaes-and-flat-text-file
- http://www.excellware.com/docs/tools/Overview-ZIP.htm
- http://www.worldcitiesdatabase.com/
- https://www.50states.com/zipcodes/
- https://tommcfarlin.com/country-state-and-city/
- https://www.zip-codes.com/search.asp
- http://sqldbpros.com/2011/11/free-zip-code-city-county-state-csv/
- https://www.foreign-trade.com/resources/country-code.htm
This was just a test to see how's the database. Didn't make it.