Capital with I

• Indianapolis

  State capital of Indiana, USA - nice!

• Istanbul

  Historic capital of the Ottoman Empire.

• Itanagar

  Capital of Arunachal Pradesh in India.

• Imphal

  Capital of Manipur state in India.

• Innsbruck

  Capital of Tyrol state in Austria.

• Iqaluit

  Capital of Nunavut territory, Canada.

The words in the list Capital with I come from players of the word game Categories game.