Muzaffarpur's 2021 population is now estimated at 516,403. In 1950, the population of Muzaffarpur was 72,105. Muzaffarpur has grown by 12,245 since 2015, which represents a 2.43% 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 Muzaffarpur, which typically includes Muzaffarpur's population in addition to adjacent suburban areas.