Ubon Ratchathani's 2021 population is now estimated at 501,747. In 1950, the population of Ubon Ratchathani was 18,129. Ubon Ratchathani has grown by 6,439 since 2015, which represents a 1.30% 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 Ubon Ratchathani, which typically includes Ubon Ratchathani's population in addition to adjacent suburban areas.