Former IDU members

Former IDU members include those which ceased to exist through inactivity while still members of the International Democratic Union and those who changed regions.

Extinct member nations

• The Republic of American Federalist
• The Sultanate of The Ayyubids
• The Federation of Bindar
• The Dominion of Canadian Air Force, post-1965 RCAF ensign
• Cheney-land, former UN delegate
• Crunkistan
• The Democratic Republic of Dee Dee Ramone
• The Armed Republic of DestinyEarth
• The Democratic Republic of Hipoa
• The Logical Klerostocracy of Horwitz, August 2005
• The Holy Empire of Kanine Crusaders
• The Free Land of Lawtonia
• The Free Land of Lynahstan, CareBear themed, August 2005
• The Confederacy of Malgaria
• The Most Serene Republic of Morning Glorys
• The Allied States of Nice and Cosy, tea cup flag
• The Democratic States of Plesentland
• The United States of Randomerica, former Immigration Minister and UN delegate
• The Holy Empire of Ratvipa
• Riconiaa
• The Queendom of Stillvoice, September 2005
• The Commonwealth of Sullivan-upon-Nova, Irish theme, September 2005
• The Borderlands of TorturedEarth
• The Free Land of Unisuits
• The Empire of Vampyro
• The Federation of Yuunli

Emigrated member nations

Only those who were IDU members in good standing for a significant time are listed, visitors, would-be raiders and those just passing through are ineligible.

• The Federation of Bindar
• The Nationy nation nation of Ham3
• The Constitutional Monarchy of Malabra, moved to Red Sox Nation, November 2006
• The Federation of Rush-ia
• The Republic of Umur