The current metro area population of Nagasaki in 2026 is 393,000, a 1.01% decline from 2025.

• The metro area population of Nagasaki in 2025 was 397,000, a 0.75% decline from 2024.
• The metro area population of Nagasaki in 2024 was 400,000, a 0.74% decline from 2023.
• The metro area population of Nagasaki in 2023 was 403,000, a 0.98% decline from 2022.