Siofok's 2026 population is now estimated at 23,827. In 1980, the population of Siofok was 20,125. Siofok has grown by 21 in the last year, which represents a 0.09% annual change. These population values and projections come from Hungary historical city/town census values 1980 and 1990 via CityPopulation fallback access, Hungary Census 2022 API (WBS003) settlement population (2001, 2011, 2022), Hungary city/town 2025 official estimate via CityPopulation fallback access and World Population Review Internal Projections .