1. Switzerland

Bern

Capital of Switzerland is Bern, Region is Europe, Population in Switzerland is 8,654,622 and area length is 41,277 SQ.KM

2. Canada

Ottava

Capital of Canada is Ottava, Region is North America, Population in Canada is 37,742,154 and area length is 9,984,670 SQ.KM

3. Japan

Tokyo

Capital of Japan is Tokyo, Region is Asia, Population in Japan is 126,476,461 and area length is 377,915 SQ.KM

4. Germany

Berlin

Capital of Germany is Berlin, Region is Europe, Population in Germany is 83,783,942 and area length is 357,022 SQ.KM

5. Australia

Canberra

Capital of Australia is Canberra, Region is  Oceania, Population in Australia is 25,499,884 and area length is 7,741,220 SQ.KM

6. United Kingdom

London

Capital of  the United Kingdom is London, Region is Europe, Population in the United Kingdom is 67,886,011 and area length is 243,610 SQ.KM

7. United States

Washington DC

Capital of the United States is Washington D.C, Region is North America, Population in the United States is 331,002,651 and area length is 9,833,517 SQ.KM

8. Sweden

Stockholm

Capital of Sweden is Stockholm, Region is Europe, Population in Sweden is 10,099,265 and area length is 450,295 SQ.KM

9. Netherlands

Amsterdam

Capital of Netherlands is Amsterdam, Region is Europe, Population in the Netherlands is 17,134,872 and area length is 41,543 SQ.KM

10. Norway

Oslo

Capital of Norway is Oslo, Region is Europe, Population in Norway is 5,421,241 and area length is 323,802 SQ.KM

Based on 2020 and according to google