The current metro area population of Seongnam in 2025 is 943,000, a 0.11% increase from 2024.

• The metro area population of Seongnam in 2024 was 942,000, a 0% increase from 2023.
• The metro area population of Seongnam in 2023 was 942,000, a 0% increase from 2022.
• The metro area population of Seongnam in 2022 was 942,000, a 0% increase from 2021.