Wildhaus was until 31 December 2009, a municipality in the canton of St. Gallen Obertoggenburg in Switzerland. On 1 January 2010, the municipalities Wildhaus and Alt St. Johann merged the new municipality Wildhaus-Alt St. Johann. The name Wildhaus is derived from the wild castle wurde.Mit called s'Wild Huus 9658 Wildhaus has the highest zip code Switzerland. Until 1939 Wildhaus had no crest. For the Swiss National Exhibition in 1939 all Swiss municipalities had to keep ready a coat of arms. The St. Gallen Graphic Willy Baur designed the current coat of arms with the Capricorn St. commissioned by the cantonal crest Commission Gallen.