L1 users: 16,800 (2006 IMB).
Andhra Pradesh state; Kerala state: Idukki district, Devikulam sub-district, Adimali and Devikulam blocks; Ernakulam, Kannur, Kottayam, Kozhikode, and Thrissur districts; Tamil Nadu state: Coimbatore district, Udumalpet and Valparai sub-districts, Anaimalai hills; Madurai district, Cardamom hills.
Western Muthuvan (Malayalam Muthuvan, Nattu Muthuvan), Eastern Muthuvan (Pandi Muthuvan, Tamil Muthuvan). Intelligibility 82%–87% between dialects, eastern dialect more intelligible to western than vice versa, 80% intelligibility of Malayalam [mal]. Lexical similarity: 77%–88% between dialects, 62%–67% with Tamil [tam], 58%–68% with Malayalam [mal].
A Scheduled Tribe. Hindu.