Languages of Poland

Polish Language - Polish is a language in the Polish republic and is the main language spoken in Poland. These include both the languages of the country's indigenous population and the languages of immigrants and their descendants. The only official language of Poland, according to the Constitution, is Polish. The overwhelming majority of the country's population speaks it as a native language or as the language of home communication.
The deaf communities use Polish Sign Language belonging to the German family of Sign Languages.
The variety of languages spoken by the Polish people and ethnic groups(excluding Polish), that have lived in the region for at least 100 years are legally recognized as regional and minority languages, which have appropriate rules of use. In territory administrated areas, where the number of minority language speakers or regional language speakers is 20% or greater, the languages can have the status of an auxiliary language for the people, while Polish is the official language.
According to the Act of 6 January 2005 on national and ethnic minorities and on the regional languages, 16 other languages have officially recognized status of minority languages: 1 regional language, 10 languages of 9 national minorities (the minorities that have their own independent state elsewhere) and 5 languages of 4 ethnic minorities (spoken by the members of minorities not having a separate state elsewhere). Jewish and Romani minorities have 2 recognized minority languages each.
The following languages are spoken in Poland as well:
Languages used in household contacts.
Population by type and number of languages used in household contacts
in 2011.
Languages having the status of ethnic minority's language.
The official recognition gives to the representatives of the minority certain rights (under certain conditions prescribed by the laws): of education in their language, of having the language established as the secondary administrative language or help language in their municipalities, of financial support of the state to the promotion of their language and culture etc.
Languages having auxiliary language status in certain communes.
The bilingual status of gminas (municipalities) in Poland is regulated by the "Act of 6 January 2005 on National and Ethnic Minorities and on the Regional Languages", which permits certain gminas with significant linguistic minorities to introduce a second, auxiliary language to be used in official contexts alongside Polish. So far 44 gminas have done this: The number in brackets refers to the number of gminas the language holds this status.
Languages exercising bilingual settlement naming rights in certain communes.
Officially any officially recognised or regional or minority language can be applied by a settlement to have this right however only 5 of the language communities have exercised this power. Number of settlements with dual language naming rights in brackets.
Languages of new diasporas and immigrant communities.
These languages are not recognised as minority languages, as the Act of 2005 defines minority as "a group of Polish citizens (...) striving to preserve its language, culture or tradition, (...) whose ancestors have been living on the present territory of the Republic of Poland for at least 100 years":
Sign languages.
The Polish Sign Language is the language of the Deaf community in Poland. It descends from German Sign Language. Its lexicon and grammar are distinct from the Polish language, although there is a manually coded version of Polish known as "System Językowo-Migowy" (SJM, or Signed Polish), which is often used by interpreters on television and by teachers in schools. In 2012, under the "Sign Language Act", the language received official status and can be chosen as the language of instruction by those who require it.
Dead and artificial languages.
Among languages used in Poland, Ethnologue. mentions:
but does not mention two other known defunct languages: