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The question is about identifying the Indian state or Union Territory with the least population as per the 2001 census.
1. Chandigarh: Being a city and Union Territory combined, Chandigarh has a considerable population, higher than Sikkim.
2. Mizoram: Even though Mizoram is one of the least populated states in India, its population as per the 2001 census was higher than that of Sikkim.
3. Puducherry: As a Union Territory, Puducherry`s population is significantly smaller compared to many Indian states but still larger than Sikkim`s population.
4. Sikkim: The state of Sikkim in the Northeast of India had the smallest population as per the 2001 census, making this the correct answer.
In conclusion, according to the Census of India 2001, Sikkim had the smallest population among the given options.