This category only includes languages that are official throughout the whole country (with the exception of Belgium) - languages that are e.g. regionally 'co-official' are not listed here but can be identified in the categories below wherever a relevant legal document is listed. A future update could include lists of co-official languages, as well. To increase their visibility, recognised Sign Languages are always listed as official languages even if they are not yet technically official. The data on legal recognition was aggregated from legal documents and official sources. Wherever possible, the national number was taken from a national census or recent study/official estimate – sources are listed. The endangerment level is adopted from Ethnologue and further estimates of endangerment can be found on the individual language profile (e.g. by clicking on 'Italian').

This includes languages recognised under the European Charter of Regional and Minority Languages (ECRML). The data on legal recognition was aggregated from legal documents and official sources. Wherever possible, the national number was taken from a national census or recent study/official estimate – sources are listed. The endangerment level is adopted from Ethnologue and further estimates of endangerment can be found on the individual language profile (e.g. by clicking on 'Czech').

Languages listed with an 'established status' in Ethnologue. The data on legal recognition, national number, and endangerment level was taken from Ethnologue, reflecting its current state and gaps of knowledge.