text: All eligible voters receive a letter in the mail to their registered address prior to election Sunday showing the date, time and local polling place, which is almost invariably the nearest school or the town hall in very small towns without a school. Polling may also be done at a Spanish diplomatic mission if residing overseas. All absentee and early voting ballots are sent physically to the registered local polling station for counting and double checking the voter's identity with the electoral roll eliminating any risk of double voting. Government-issued ID is required to vote. Voting is not compulsory.
  Sweden
  Voter registration in Sweden is automatic and based on the national population register, Folkbokföringsregistret, administered by the Swedish Tax Agency, where all citizens and residents of Sweden are included. Permanent residents are recorded in this register even if they are not citizens but enjoy right of residence, and their citizenship status is indicated in the register.
  Only Swedish citizens being 18 years old on the election day and living in Sweden may vote in all public elections. Registered residents may vote in local and regional elections if they are citizens of another EU Member State, Iceland or Norway. Citizens of other countries and stateless persons can vote in the municipal and county elections if they have been recorded in the Swedish Population Register for at least three consecutive years before election day. Swedish citizens that are resident abroad have the right to vote in Riksdag and EU elections only. To maintain a record in the electoral roll as an expatriate, one needs to refresh the registration within 10 years; a vote counts as a valid refresh.