Balikesir's 2025 population is now estimated at 354,366. In 1950, the population of Balikesir was 32,180. Balikesir has grown by 5,585 in the last year, which represents a 1.6% 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 Balikesir, which typically includes Balikesir's population in addition to adjacent suburban areas.