What data areaCode and metroCode columns contain for in maxmind?

Question

As i inderstand area code - is regional telephone code, right? What for metro code column stays for then?

Answer 1

A metro code is a zip code like in the states, e.g. 24100

Answer 2

Metro Code is a DMA code like "803" for Los Angeles, as defined by Google AdWords. Area code is, indeed, the telephone prefix after the country code.

https://developers.google.com/adwords/api/docs/appendix/cities-DMAregions