Там же нормальная <a href="https://download.geonames.org/export/dump/readme.txt" rel="nofollow">сопроводительная документация</a> : <br/> <br/> <blockquote>The data format is tab-delimited text in utf8 encoding.</blockquote> <br/> <br/> <blockquote>The main 'geoname' table has the following fields :<br/>
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geonameid : integer id of record in geonames database<br/>
name : name of geographical point (utf8) varchar(200)<br/>
asciiname : name of geographical point in plain ascii characters, varchar(200)<br/>
alternatenames : alternatenames, comma separated, ascii names automatically transliterated, convenience attribute from alternatename table, varchar(10000)<br/>
latitude : latitude in decimal degrees (wgs84)<br/>
longitude : longitude in decimal degrees (wgs84)<br/>
feature class : see <a href="http://www.geonames.org/export/codes.html" rel="nofollow">www.geonames.org/export/codes.html</a>, char(1)<br/>
feature code : see <a href="http://www.geonames.org/export/codes.html" rel="nofollow">www.geonames.org/export/codes.html</a>, varchar(10)<br/>
country code : ISO-3166 2-letter country code, 2 characters<br/>
cc2 : alternate country codes, comma separated, ISO-3166 2-letter country code, 200 characters<br/>
admin1 code : fipscode (subject to change to iso code), see exceptions below, see file admin1Codes.txt for display names of this code; varchar(20)<br/>
admin2 code : code for the second administrative division, a county in the US, see file admin2Codes.txt; varchar(80) <br/>
admin3 code : code for third level administrative division, varchar(20)<br/>
admin4 code : code for fourth level administrative division, varchar(20)<br/>
population : bigint (8 byte int) <br/>
elevation : in meters, integer<br/>
dem : digital elevation model, srtm3 or gtopo30, average elevation of 3''x3'' (ca 90mx90m) or 30''x30'' (ca 900mx900m) area in meters, integer. srtm processed by cgiar/ciat.<br/>
timezone : the iana timezone id (see file timeZone.txt) varchar(40)<br/>
modification date : date of last modification in yyyy-MM-dd format</blockquote>