text: All permanent residents of Germany are required to register their place of residence (or the fact that they are homeless) with local government. Citizens who will be 18 or older on the day of voting automatically receive a notification card in the mail some weeks before any election in which they are eligible to vote: for local elections, resident citizens of other EU countries will also receive these cards and may vote. Polling places have lists of all eligible voters resident in the neighborhood served by the particular station; the voter's notification card (or photo ID such as an identity card or passport if the notification card is not at hand) is checked against these lists before individuals receive a ballot. Voting is not compulsory.
  Hong Kong
  In Hong Kong all permanent residents who are above 18 years of age and do not suffer from a mental illness can register as voters. Imprisoned people can also register and vote since the laws prohibiting them from voting was ruled unconstitutional in 2009 and are able to vote since mid-2010 as the electoral roll is updated annually. The registration process is voluntary. In 2002 around 1.6 million permanent residents did not register.
  Iceland
  All citizens of Iceland are registered in a central database at birth, which is maintained by Registers Iceland. They do not need to register separately to vote.