The current metro area population of Diwaniyah in 2026 is 630,000, a 3.11% increase from 2025.

• The metro area population of Diwaniyah in 2025 was 611,000, a 3.21% increase from 2024.
• The metro area population of Diwaniyah in 2024 was 592,000, a 3.5% increase from 2023.
• The metro area population of Diwaniyah in 2023 was 572,000, a 3.44% increase from 2022.