Many languages are spoken in Mexico, though Spanish is the most widespread. The indigenous languages are from eleven language families, including four isolates and one that immigrated from the United States. The Mexican government recognizes 68 national languages, 63 of which are indigenous, including around 350 dialects of those languages. The large majority of the population is monolingual in Spanish. Some immigrant and indigenous populations are bilingual, while some indigenous people are monolingual in their languages. Mexican Sign Language is spoken by much of the deaf population, and there are one or two indigenous sign languages as well.