Muzaffarpur's 2025 population is now estimated at 567,318. In 1950, the population of Muzaffarpur was 72,105. Muzaffarpur has grown by 13,031 in the last year, which represents a 2.35% 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.