In Argentina everyone will understand you, but if you don't use "ito" then people may ask where are you from. "ico" is used in many countries of Central Americ

In Argentina everyone will understand you, but if you don't use "ito" then people may ask where are you from. "ico" is used in many countries of Central America and Caribe. I asked someone from Colombia, so I'm sure about Colombia but I'm no sure about every other country. Is "illo" used in Madrid? I think I heard it in movies or TV programs from Spain.