Location data, for my own database - mysql

I have a database of citi开发者_高级运维es. One table, 'city' holds over 311,000 cities and data like its region and long and lat, these link to a table 'country' via country_id. What I want to do is add another field in my 'city' table for population and another for area (km squared) then i can create another myself for population density.

My question is, where would be the best place to get a cities population and km^2 online using some kind of api so i can write a script which adds these rows?

I have tried googling and also looked at the google maps api itself. But I think I've hit a wall because I just have no idea where I would get this.

By the way, I got my city data from geonames, and this doesn't come with population already, and as you can imagine I don't want to google over 311,000 cities and manually update it myself.

Thanks in advance! :)

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since i located spreadsheet data, and no other comments: i'll post here as an answer :)

http://quickfacts.census.gov/qfd/states/51000lk.html