The current metro area population of Okayama in 2025 is 719,000, a 0.14% decline from 2024.

• The metro area population of Okayama in 2024 was 720,000, a 0.28% decline from 2023.
• The metro area population of Okayama in 2023 was 722,000, a 0.14% decline from 2022.
• The metro area population of Okayama in 2022 was 723,000, a 0.14% decline from 2021.