Île-de-France

Jan 1, 1941 | State / Province |

...

Võru County (Vorumaa)

Jan 1, 1938 | State / Province |

Liechtenstein

Jun 24, 1937 | Country flag, State flag |

...

Vatican City

Jun 7, 1929 | Country flag, Special, State flag, War flag |

Together with Switzerland the only square flag in the world....

Alaska

Jul 9, 1927 | State / Province |

...