Basel's 2026 population is now estimated at 583,088. In 1950, the population of Basel was 256,293. Basel has grown by 4,361 in the last year, which represents a 0.75% 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.