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All 45 island countries

An island country is a sovereign state whose land lies wholly on islands. Indonesia has the most people and the most land, and Nauru is the smallest.

Caribbean and Atlantic (18)

Antigua and BarbudaSaint John's · 94,200BahamasNassau · 403,000BarbadosBridgetown · 282,600Cabo VerdePraia · 527,300CubaHavana · 10.9 millionDominicaRoseau · 65,900Dominican RepublicSanto Domingo · 11.5 millionGrenadaSaint George's · 117,300HaitiPort-au-Prince · 11.9 millionIcelandReykjavík · 392,400IrelandDublin · 5.5 millionJamaicaKingston · 2.8 millionSaint Kitts and NevisBasseterre · 46,900Saint LuciaCastries · 180,100Saint Vincent and the GrenadinesKingstown · 99,900São Tomé and PríncipeSão Tomé · 240,300Trinidad and TobagoPort-of-Spain · 1.4 millionUnited KingdomLondon · 69.5 million

Mediterranean (2)

CyprusNicosia · 1.4 millionMaltaValletta · 579,700

Indian Ocean (7)

BahrainManama · 1.6 millionComorosMoroni · 882,800MadagascarAntananarivo · 32.7 millionMaldivesMalé · 529,700MauritiusPort Louis · 1.2 millionSeychellesVictoria · 122,700Sri LankaSri Jayawardenepura Kotte and Colombo · 21.8 million

Asia and the Pacific Rim (5)

IndonesiaJakarta · 285.7 millionJapanTokyo · 123.4 millionPhilippinesManila · 116.8 millionSingaporeSingapore · 6.1 millionTimor-LesteDili · 1.4 million

Pacific islands (13)

FijiSuva · 933,200KiribatiSouth Tarawa · 136,500Marshall IslandsMajuro · 36,300MicronesiaPalikir · 113,700NauruYaren · 12,000New ZealandWellington · 5.3 millionPalauNgerulmud · 17,700Papua New GuineaPort Moresby · 10.8 millionSamoaApia · 219,300Solomon IslandsHoniara · 838,600TongaNuku'alofa · 103,700TuvaluFunafuti · 9,490VanuatuPort Vila · 335,200

What counts as an island country?

WorldIslands counts countries whose whole territory is on islands, including those that share an island with a neighbour, such as Haiti and the Dominican Republic on Hispaniola, or Papua New Guinea and Indonesia on New Guinea. Australia is treated as a continent, so it is not on this list.