German is the country's only official language:
Liechtenstein
German is the majority language, and shares official status with other languages:
Germany (besides locally Sorbian, Frisian, Danish, and Romani)
Austria (besides locally Slovene, Croatian, and Hungarian)
Luxembourg (besides French and Luxembourgish)
Switzerland (besides French, Italian and Romansh)
German is a minority language with official status:
Belgium (besides Dutch and French)
German language has official status only in part of the country/territory:
Italy (South Tyrol)
Poland. Polish part of Silesia, mainly Upper Silesia. See also: German minority in Poland
http://en.wikipedia.org/wiki/German_language_in_Europe