I've collected about 57,000 cities from a city field found in LJ user foaf feeds. This field has its problems. It might be blank 90% of the time, people write mumbo jumbo in it, and people often write the same city's name more than one way. Still, it can sense large city names.
These are the most common cities among actively-posting LJers's:
users | city 926 | Moscow 857 | Москва (Moscow) 346 | Seattle 205 | San+Francisco 202 | Toronto 200 | Chicago 197 | London 195 | Portland 159 | New+York 151 | Austin 145 | Los+Angeles 138 | Melbourne 135 | Санкт-Петербург (St. Petersburg) 128 | Boston 123 | Minneapolis 107 | Brooklyn 103 | Atlanta 103 | Vancouver
Welcome to the new LiveJournal
Some changes have been made to LiveJournal, and we hope you enjoy them! As we continue to improve the site on a daily basis to make your experience here better and faster, we would greatly appreciate your feedback about these changes. Please let us know what we can do for you!