It seems unless someone starts campaigning for other country, I'll have to play with the Incas, so let's give some stats:
There are 25 provinces that start with an "I".
Of those 25, 13 are occupied provinces and 12 are unoccupied ones.
We have provinces all of the continents:
America: 6
Itamaraca (Colony, Brazil)
Ilheus (Colony, Brazil)
Itenenis (Colony, Brazil)
Iowa (Colony, US)
Illinois (Colony, US)
Innu (Colony, Canada)
Europe: 4
Ile-de-France (France)
Istria (Venice)
Ingermanland (Novgorod)
Idnakar (Kazan)
Asia: 8
Iraq-I-Arab (Qara Koyunlu)
Imereti (Georgia)
Indravarti (Gondwana)
Indus (Timurids)
Izumo (Japan)
Ilimsk (Colony, Russia)
Irkutsk (Colony, Russia)
Africa: 7
Ifni (Morocco)
Ivory Coast (Colony, Ivory Coast)
Ife (Oyo)
Idah (Colony, Nigeria)
Inhambane (Colony, South Africa)
Ifat (Ethiopia)
Ibrim (Mamluks)
Oceania: 1
Irian (Colony, Indonesia)
So, as you can see, even not being so many of them, I'll be having a tough time getting all of them, first update coming probably on Tuesday.