The current metro area population of Oita in 2025 is 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.
• The metro area population of Oita in 2022 was 478,000, a 0.21% decline from 2021.