data sydney 2023Sydney ; 5,557,233 (2025) (1st) · 441km2 (1,140sq mi) (2025) · 26 January 1788; 237 years ago (1788-01The City of Sydney's Gross Regional Product was $154,755m in 202524. The Gross Regional Product of an area is the equivalent of Gross Domestic Product, but for a smaller area. It is