This article presents data on bilingual proficiency collected in 1992 and 1993 from speakers in seven different Tibeto-Burman ethnolinguistic groups in rural Nepal. Over five hundred subjects were tested, using sentence repetition tests. These data are correlated with demographic variables to show the significant indicators of Nepali proficiency among the target population. The results show that only well-educated subjects are comparably proficient in Nepali with mother-tongue Nepali speakers. (Rajeev Ranjan Singh 2007-03-05)