NO 10 is Saint Martin: 

Area:53sqkm

Population:37264




No 9th is Sint Maartin.
Area: 34 Sqkm
Population: 43118


8th is Macao Sar China
Area: 30 Sqkm
Population:649335


7th is Tuvalu
Area: 26 Sqkm
Population:11342


6th is Nauru
Area: 21Sqkm
Population:10858


5th Smallest Country is Saint Barthelemy
Area: 21Sqkm
Population: 7122