We ran a Twitter contest to see if anyone could guess the city that has the most visitors to IPVM. Despite more than a dozen entries, no one got it right. Here's the results (taken from the month of August):
Taipei is the clear #1 as it has been pretty much forever. Of course, that's still only ~3% of total IPVM traffic so overall, it is not huge. Nonetheless, it is still highly disproportionate, likely reflecting the large number of Taiwanese manufacturers based in the Taipei region. Ditto Seoul.
Also, notice 15 of the top 20 cities are not from the US.
Btw, because this is August, the total numbers are lower (summer time) and certain cities are down disproportionately (e.g., Northern Europe where they all go on vacation).
All that said, this gives a rough idea of where people are visiting from. Let me know if you have questions.