Wymysorys was the vernacular language of Wilamowice until World War II. However, it seems it has been in decline since the late 19th century. In 1880 as many as 92% of the town's inhabitants spoke Wymysorys (1,525 out of 1,662 people), in 1890 - only 72%, in 1900 - 67%, in 1910 - 73% again. Although Wymysorys was taught in local schools (under the name of "local variety of German"), since 1875 the basic language of instruction in most schools in Austro-Hungarian Galicia was Polish. During World War II and the German occupation of Poland Wymysorys was openly promoted by the Nazi administration, but after the war the tables turned: local communist authorities forbade the use of Wymysorys in any form. The widespread bilingualism of the people saved most local residents from being forcibly resettled to Germany, many of them stopped teaching their children their language or even using it in daily life. Although the ban was lifted after 1956, Wymysorys has been gradually replaced by Polish, especially amongst the younger generation.