São Tomé and Príncipe and Hong Kong are almost exactly the same size

São Tomé and Príncipe covers about 1,040 km² (400 mi²) and Hong Kong about 1,040 km² (400 mi²). Their outlines are laid over each other below at one scale.

1,040km²São Tomé and Príncipe
1,040km²Hong Kong

20 km

São Tomé and Príncipe
Hong Kong

What fits

Hong Kong is 100% of the size of São Tomé and Príncipe.
The measured areas differ by 1.0 km², less than half a percent: closer than the measurement itself is certain.
Measured in Belgiums: São Tomé and Príncipe is about 0.03, Hong Kong about 0.03.

How they differ

São Tomé and Príncipe is larger, but Hong Kong has the larger population: 7.4 million against 204,000, 36.3× as many people.
Per square kilometre that is 7,154 in Hong Kong against 197 in São Tomé and Príncipe: Hong Kong is 36.3× as densely populated.
Their centres are about 11,800 km apart.
On a standard web map Hong Kong looks larger than São Tomé and Príncipe: São Tomé and Príncipe at 0°N is drawn about 1.0× too large and Hong Kong at 22°N about 1.2×, so the map shows Hong Kong as 1.17× the size of São Tomé and Príncipe, when São Tomé and Príncipe is 1.00× the size of Hong Kong.
Together São Tomé and Príncipe and Hong Kong cover 2,070 km², close to the size of Mauritius (2,000 km², 3.5% smaller).
At Hong Kong's density, São Tomé and Príncipe would have 7.4 million people (it has 204,000). At São Tomé and Príncipe's density, Hong Kong would have 204,000 (it has 7.4 million).
Hong Kong's centre is 21.9° of latitude, about 2,440 km, farther north than São Tomé and Príncipe's.

Who wins on what

Measure	Winner	By
Larger area	São Tomé and Príncipe	1.00×
More people	Hong Kong	36.3×
More crowded	Hong Kong	36.3×
Farther north	Hong Kong	21.9° of latitude
Stretched more on a web map	Hong Kong	1.2× against 1.0×

Both against the same yardsticks

Yardstick	São Tomé and Príncipe	Hong Kong
Belgium 30,700 km²	0.03×	0.03×
United Kingdom 244,000 km²	1 in 235	1 in 235
Germany 358,000 km²	1 in 345	1 in 345
Japan 374,000 km²	1 in 360	1 in 360
France 548,000 km²	1 in 528	1 in 529
India 3,151,000 km²	1 in 3,038	1 in 3,041
Brazil 8,473,000 km²	1 in 8,169	1 in 8,177
United States 9,447,000 km²	1 in 9,109	1 in 9,117
Russia 16,980,000 km²	1 in 16,371	1 in 16,387

Each figure is the place's area divided by the yardstick's.

Side by side

	São Tomé and Príncipe	Hong Kong
Area, main territory	1,040 km²400 mi²	1,040 km²400 mi²
Population	204,000Wikidata, 2017	7.4 millionWikidata, 2021
Density	197 per km²	7,154 per km²
Official area	1,000 km²Wikidata	2,760 km²Wikidata
Capital	São Tomé	–
Latitude range	0°N to 2°N	22°N to 23°N
Continent	Africa	Asia

Population: Wikidata 2017 and Wikidata 2021, covering each whole country. Official figures: Wikidata (CC0).

Our measured 1,040 km² is 3.6% above Wikidata's official figure of 1,000 km². Official figures can include inland water or count land that an outline draws differently.
Our measured 1,040 km² is 62% below Wikidata's official figure of 2,760 km². Official figures can include inland water or count land that an outline draws differently. This difference is flagged for review.

Similar in size to São Tomé and Príncipe

Similar in size to Hong Kong

More comparisons

Sources and method

Outlines: Natural Earth, 1:10m Admin 0 - Countries, public domain
Boundary: De facto, as drawn by Natural Earth. Main territory: the largest landmass and every part within 1,000 km of it.
Area: Measured on the WGS84 ellipsoid from the full-detail outlines, shown rounded. Comparisons use main-territory area.
Drawing: Each outline is projected with an equal-area projection centred on its own centroid, so areas stay true and the two can be laid over each other.
Data built: 2026-11-11

Full method