The largest urban area in Oceania is Sydney, followed by Melbourne and Auckland. Sydney has 4.38 million people on 1,378 km² of built-up land. 15 urban areas in Oceania have at least 1 million people or are a national capital; the table lists them all.
| # | City | Population |
|---|---|---|
| 1 | Sydney | 4.38 million |
| 2 | Melbourne | 4.01 million |
| 3 | Auckland | 1.62 million |
| 4 | Brisbane | 1.36 million |
| 5 | Perth | 1.36 million |
| 6 | Port Moresby | 442,165 |
| 7 | Suva | 242,910 |
| 8 | Wellington | 154,120 |
| 9 | Nouméa | 153,190 |
| 10 | Honiara | 137,201 |
| 11 | Papeete | 109,747 |
| 12 | Port Vila | 72,613 |
| 13 | Apia | 60,042 |
| 14 | Canberra | 55,458 |
| 15 | Nuku'alofa | 51,991 |
Urban area = contiguous built-up land and the people living in it in 2025, drawn the same way for every city regardless of administrative boundaries. Source: GHSL Urban Centre Database R2024A, European Commission, Joint Research Centre (CC BY 4.0); some names adjusted to the city names people use, and country attribution follows the dataset.
Official city limits are drawn differently in every country: some take in farmland and mountains, others stop at the historic core. Ranking cities by those limits mostly ranks boundary decisions. These lists use the built-up area instead, so a city's figure includes its suburbs wherever they are continuous with it, and nothing beyond.
For figures inside official limits, see the city-limits rankings; for the background, read how to compare city sizes honestly. Click any city to see it on a map at the same scale as another.