Here's the entry on Asturian language from the Ethnologue site...

ASTURIAN (BABLE) [AUB] 100,000 first language speakers, plus 450,000 second language speakers able to speak or understand it (1994 F. F. Botas). 50,000 in Central Asturian, 30,000 in Western Asturian, 20,000 in Eastern Asturian. 550,000 in the ethnic group. Princedom of Asturias except for the most western section where Galician is spoken, the western part of Cantabria, and northern Castilla-Leon. Indo-European, Italic, Romance, Italo-Western, Western, Ibero-Romance, North, Central. Dialects: WESTERN ASTURIAN, CENTRAL ASTURIAN (BABLE), EASTERN ASTURIAN. As different from Spanish as Galician or Catalan; more different than Murcian and Andalusian. Close to Leonese. About 80% intelligibility with Spanish (R.A. Hall, Jr. 1989); enough to cause disruption of communicative ability (T. Erickson SIL 1992). They use Spanish in formal situations and with outsiders. Children ages 6 to 16 are obliged to study Asturian in school; it is voluntary for those 16-19. There is literature, both popular and literary, since the 17th century; poetry, and traditional ballads and chivalric novels of oral tradition. The Academy of the Asturian Language was formed in 1981, to revive the academy of the 18th century. The Vaqueros ethnic group speaks Western Asturian. Intelligibility among the three dialects is adequate, but Western Asturian may need orthography adaptation. Central Asturian is considered the model, and has the most speakers. Bible portions 1871-1991. Work in progress.

---Lepus Rex