The current metro area population of Kalasin in 2025 is 552,000, a 1.28% increase from 2024.

• The metro area population of Kalasin in 2024 was 545,000, a 1.3% increase from 2023.
• The metro area population of Kalasin in 2023 was 538,000, a 1.32% increase from 2022.
• The metro area population of Kalasin in 2022 was 531,000, a 1.14% increase from 2021.