The current metro area population of Karaj in 2025 is 1,615,000, a 0.75% increase from 2024.

• The metro area population of Karaj in 2024 was 1,603,000, a 0.56% increase from 2023.
• The metro area population of Karaj in 2023 was 1,594,000, a 0.44% increase from 2022.
• The metro area population of Karaj in 2022 was 1,587,000, a 0.32% increase from 2021.