Need to correct that the following is how this works in Iceland:
- Icelandic citizen, at least 18 years of age with legal domicile in the municipality in question
- They are either Finnish, Norwegian, Danish or Swedish citizens and fulfill later half of first requirement
- Any other citizen of another state that has had residency in Iceland for 3 years consecutively and fulfills the later half of the first requirement.
So any scandinavian, of age, who moves their domicile to Iceland can immediatly participate in the municipality votes, while others require a 3 year wait.
Citizenship (able to be gained after ~6 years of residency) is required for national elections.