In brief
The largest documented number lives in United States: 1,530,344 people in the 2023 census.
Main language: Welsh. Glottolog classifies it in the Indo-European family.
Where they live: census figures
Each figure comes from the country's official census. Censuses define belonging differently (self-identification, citizenship, mother tongue, ancestry); the type is given on each row.
United States
1,530,344
United Kingdom
251,000
Languages and their lineage
Welsh
- Indo-Europeanindo1319
- Classical Indo-Europeanclas1257
- Celticcelt1248
- Nuclear Celticnucl1715
- Core Celtictgbc1234
- Insular Celticinsu1254
- Brythonicbryt1239
- Old-Modern Welsholdm1247
- Welshwels1247
English
- Indo-Europeanindo1319
- Classical Indo-Europeanclas1257
- Germanicgerm1287
- Northwest Germanicnort3152
- West Germanicwest2793
- North Sea Germanicnort3175
- Anglo-Frisianangl1264
- Anglicangl1265
- Later Angliclate1254
- Middle-Modern Englishmerc1242
- Macro-Englishmacr1271
- Englishstan1293
People-to-language links: Wikidata (properties P103 and P2936), checked against ISO 639-3 codes. Language classification: Glottolog 5.3.
Sources
- U.S. Census Bureau. ACS 2023 1-year, Table B04006 (variable B04006_093E, label Estimate!!Total:!!Welsh). https://data.census.gov/api/access/data/table?id=ACSDT1Y2023.B04006&g=010XX00US
- Welsh Government. Ethnic group, national identity, language and religion in Wales (Census 2021). https://www.gov.wales/ethnic-group-national-identity-language-and-religion-wales-census-20…
- Hammarström H., Forkel R., Haspelmath M., Bank S. (2026). Glottolog 5.3. Max Planck Institute for Evolutionary Anthropology. glottolog.org (CC BY 4.0)