To determine the least populated state from the provided options in 2011, reference was made to the Census of India data for that year. The Census records official population figures. By comparing the listed states—Haryana, Tripura, Jharkhand, and Sikkim—the state with the lowest population can be identified.
| State | Population (2011) |
|---|---|
| Haryana | 25,351,462 |
| Tripura | 3,671,032 |
| Jharkhand | 32,988,134 |
| Sikkim | 610,577 |
The table above shows that Sikkim had the smallest population in 2011, with 610,577 residents. Consequently, Sikkim was the least populated state among the given choices.