If you want to save some disk space:
geonameid - can be mediumint (at least I think so, this allows for 8 million ids, or 16 million if you make it positive, whereas geonames is more around 4.5 million)
population - mediumint
altitude - smallint
gtopo30 - smallint
latitude/longitude - probably can be float for most uses (the geonames database isn't that precise)
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