What Language Do They Speak In France?

The languages of metropolitan France include:
Basque
Celtic language:
Breton
Germanic languages:
Alsatian (Elsässerdeutsch)
West Flemish dialect of Dutch
Lorraine Franconian
Romance languages:
Catalan
Corsican (Corsu)
Franco-Provençal
Bressan
Dauphinois
Forèzien
Jurassien
Lyonnais
Savoyard
Occitan language (also Lenga d'òc, Langue d'oc):
Vivaroalpenc
Auvergnat
Gascon
Ariegese (Ariégeois)
Bearnese (Béarnais)
Landese (Landais)
Languedocien
Limousin
Nissart (Niçois or Nissart)
Provençal
Oïl language family:
Bourguignon-Morvandiau
Champenois
Franc-Comtois
French
Gallo
Lorrain
Norman
Picard
Poitevin-Saintongeais
Walloon

There are migrant languages
Arabic (dialectal)
Armenian (eastern)
Bambara
Berber
Spanish
Italian
Lao
Mandarin
Polish
Portuguese
Romany
Russian
Vietnamese
Yiddish