Source: https://download.geonames.org/export/zip/allCountries.zip
data: data/allCountries.txt
Format: tab-separated values
country code : iso country code, 2 characters
postal code : varchar(20)
place name : varchar(180)
admin name1 : 1. order subdivision (state) varchar(100)
admin code1 : 1. order subdivision (state) varchar(20)
admin name2 : 2. order subdivision (county/province) varchar(100)
admin code2 : 2. order subdivision (county/province) varchar(20)
admin name3 : 3. order subdivision (community) varchar(100)
admin code3 : 3. order subdivision (community) varchar(20)
latitude : estimated latitude (wgs84)
longitude : estimated longitude (wgs84)
accuracy : accuracy of lat/lng from 1=estimated, 4=geonameid, 6=centroid of addresses or shape