Khon-Kaen's 2021 population is now estimated at 509,278. In 1950, the population of Khon-Kaen was 13,128. Khon-Kaen has grown by 6,684 since 2015, which represents a 1.33% annual change. These population estimates and projections come from the latest revision of the UN World Urbanization Prospects. These estimates represent the Urban agglomeration of Khon-Kaen, which typically includes Khon-Kaen's population in addition to adjacent suburban areas.