Sydney vs Houston
Sydney is about 7.0× larger than Houston by administrative area. Sydney (Australia) covers 12,145 km² (4,689 mi²) with a population of 5.5 million, while Houston (United States) covers 1,725 km² (666 mi²) with 2.3 million residents.
| Metric | Sydney | Houston |
|---|---|---|
| Area | 12,145 km² | 1,725 km² |
| Area (mi²) | 4,689 mi² | 666 mi² |
| Population | 5,450,496 | 2,304,580 |
| Population density | 449 /km² | 1,336 /km² |
| Area ratio | Sydney is ~7.0× larger by area than Houston. | |
Frequently asked questions
Is Sydney bigger than Houston?
Yes — Sydney is about 7.0× larger by area: 12,145 km² vs 1,725 km².
How big is Sydney?
Sydney, Australia, covers about 12,145 km² (4,689 mi²) of administrative area.
How big is Houston?
Houston, United States, covers about 1,725 km² (666 mi²) of administrative area.
Which city has more people, Sydney or Houston?
Sydney has the larger population: 5.5 million vs 2.3 million. Population density is about 449 people/km² in Sydney and 1,336 people/km² in Houston.
City boundaries from OpenStreetMap. Last updated 2026-08-19.
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