Sunkoshi Rural Municipality (Nepali: सुनकोशी गाउँपालिका) in Okhaldhunga District was formed in March 2017, by merging 5 former VDCs of Katunje, Chyanam, Mulkharka, Sisneri and Balakhu. The center of this rural municipality is located at Mulkharka.

At the time of the 2011 Nepal census, Sunkoshi Rural Municipality had a population of 18,558. Of these, 58.1% spoke Nepali, 18.9% Tamang, 10.8% Magar, 5.6% Jerung, 4.7% Rai, 1.3% Sunwar, 0.1% Maithili and 0.5% other languages as their first language.

In terms of ethnicity/caste, 26.6% were Chhetri, 19.1% Tamang, 12.7% Hill Brahmin, 11.5% Magar, 10.7% Rai, 6.3% Newar, 3.4% Kami, 2.4% Damai/Dholi, 2.1% Sunuwar and 5.2% others.

In terms of religion, 69.5% were Hindu, 19.6% Buddhist, 10.5% Kirati, 0.1% Christian and 0.3% others.