The current metro area population of St. Catharines-Niagara in 2025 is 430,000, a 0.7% increase from 2024.

• The metro area population of St. Catharines-Niagara in 2024 was 427,000, a 0.71% increase from 2023.
• The metro area population of St. Catharines-Niagara in 2023 was 424,000, a 0.71% increase from 2022.
• The metro area population of St. Catharines-Niagara in 2022 was 421,000, a 0.72% increase from 2021.