The current metro area population of Purnia in 2025 is 566,000, a 2.91% increase from 2024.

• The metro area population of Purnia in 2024 was 550,000, a 3.19% increase from 2023.
• The metro area population of Purnia in 2023 was 533,000, a 3.5% increase from 2022.
• The metro area population of Purnia in 2022 was 515,000, a 3.62% increase from 2021.