The Sikkim Krantikari Morcha (SKM) won seven Assembly seats and is leading in four constituencies while the ruling Sikkim Democratic Front won three and is ahead in six, election officials have said.
Sikkim has 32 Assembly seats.
Chief minister and SDF chief Pawan Chamling won the Poklok Kamrang Assembly seat, defeating his nearest SKM rival Kharka Bahadur Rai by 2,899 votes, the officials added.
He is also contesting Namchi Singhithang seat from where he is also leading by 289 votes.
Sitting MLA and SKM candidate Sonam Lama won the Sangha Assembly seat, defeating his nearest SDF rival Tshering Lama by 618 votes.
SKM candidate Lok Nath Sharma won the Gyalshing- barnyak seat defeating his nearest SDF rival Laxuman Sharma by 1,814 votes.