There are 192 countries in the world, only 60 of which are under 15,000 square miles.
Largest to smallest they are:
Guinea-Bissau, Moldova, Belgium, Lesotho, Armenia, Albania, Solomon Islands, Equatorial Guinea, Burundi, Haiti, Rwanda, Macedonia, Djibouti, Belize, El Salvador, Israel, Slovenia, Fiji, Kuwait, Swaziland, East Timor, Bahamas, Vanuatu, Qatar, Gambia, Jamaica, Lebanon, Cyprus, Brunei, Trinidad & Tobago, Cape Verde, Samoa, Luxembourg, Comoros, Mauritius, Sao Tome & Principe, Kiribati, Dominica, Tonga, Micronesia, Singapore, Bahrain, Saint Lucia, Andorra, Palau, Seychelles, Antigua & Barbuda, Barbados, St. Vincent & the Grenadines, Grenada, Malta, Maldives, Saint Kitts & Nevis, Marshall Islands, Liechtenstein, San Marino, Tuvalu, Nauru, Monaco and Vatican City