ladycow.com Top 10 smallest countries in the world : br br 01. Vatican 920 br 02. Tuvalu 11,640 br 03. Nauru 13,050 br 04. Palau 20,300 br 05. San Marino 28,880 br 06. Monaco 32,410 br 07. Liechtenstein 33,720 br 08. Saint Kitts & Nevis 38,960 br 09. Marshall Islands 59,070 br 10.