The current metro area population of Koriyama in 2026 is 323,000, a 0.31% decline from 2025.

• The metro area population of Koriyama in 2025 was 324,000, a 0.31% decline from 2024.
• The metro area population of Koriyama in 2024 was 325,000, a 0.61% decline from 2023.
• The metro area population of Koriyama in 2023 was 327,000, a 0.3% decline from 2022.