Rhenock was covered with dense forest in and around the 13th century. The Lepchas were the early settlers about six to five hundred years ago. After the Lepchas, Bhutias settled in the villages presently known as Kyongsa, Aritar & Chalisey. The people who settled here after 16th century were mostly from Nepali ethnic group such as Newars, Bahuns (Adhikari, Paudel, Gautam, Dahal, Bhandari and Achaarja), Chhetri (Subedi, Khatiwada & Bista), Gurung, Rai and Limboo.