The current metro area population of Oita in 2026 is 473,000, a 0.21% decline from 2025.

• The metro area population of Oita in 2025 was 474,000, a 0.21% decline from 2024.
• The metro area population of Oita in 2024 was 475,000, a 0.42% decline from 2023.
• The metro area population of Oita in 2023 was 477,000, a 0.21% decline from 2022.