Flags of the World (FOTW), founded in 1994, is the Internet’s largest site devoted to vexillology (the study of flags). Here you can read more than 52,000 pages about flags and view more than 97,000 images of flags of countries, organizations, states, territories, districts and cities, both past and present.
There are many ways to find flags on this website. Choosing “Index by Country” will take you straight to the country’s page, once there you will find pathways to the national, state, municipal, military, historical, and cultural flags and ensigns of the country. Choosing “Index by Subject” will do the same, but in a more limited manner. Choosing “Search Site by a Topic or Subject” will search the whole FOTW website looking for pages that have information that matches your search criteria. This last method will gather the most information for you. For those more graphic in nature, you can use the “clickable map” method to find your flag. In case you don’t know the origin of a flag you can try using off-site identifiers such as Ed Mooney’s The Flag Wizard or Ivan Sarajčić’s The Flag Identifier.