Basel's 2025 population is now estimated at 578,727. In 1950, the population of Basel was 256,293. Basel has grown by 4,219 in the last year, which represents a 0.73% 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 Basel, which typically includes Basel's population in addition to adjacent suburban areas.