The population of Khon Kaen is estimating at around 200,000 to 400,000 varying according to each source, but the bottom line is this is one of Thailand's largest and most populated cities. Khon Kaen University is the largest in the northeast region with an enrollment of 25,000 in the last count. The Consulates of Vietnam and Laos are both located here for travellers boarding the international buses to obtain the required visa to places such Vientiane.