The current metro area population of Cardiff in 2026 is 499,000, a 0.81% increase from 2025.

• The metro area population of Cardiff in 2025 was 495,000, a 0.61% increase from 2024.
• The metro area population of Cardiff in 2024 was 492,000, a 0.82% increase from 2023.
• The metro area population of Cardiff in 2023 was 488,000, a 0.62% increase from 2022.