Sikkim is India's first state with 100 percent sanitation coverage

Sikkim became the first State in India to achieve 100 percent sanitation coverage under the Nirmal Bharat Abhiyaan Scheme on 9 February 2014. Sikkim achieved 100 per cent sanitation in rural and urban households, schools, sanitary complexes and Aanganwadi centres. 

As per the latest progress report card released by the Union Ministry of Drinking Water & Sanitation, all 610577 inhabitants in Sikkim have latrines with high sanitation and hygiene.

Important to Note : 

Sikkim is India's least populated and second smallest state in area after Goa.