Which district has the highest density of population

Mahe, although the smallest district in the Union Territory of Puducherry, has the highest population density. This is primarily due to its small geographic area and relatively high population compared to that limited area.

Located on the western coast of India and surrounded by the state of Kerala, Mahe is an enclave that covers just about 9 square kilometers. Despite its size, it supports a significant population, resulting in a very high density figure — well above the other districts in Puducherry.

For comparison:
Pondicherry district (also known as Puducherry) has the largest population in the Union Territory but also has a larger area, so its population density is lower than that of Mahe.
Karaikal and Yanam also have smaller populations and larger areas than Mahe, leading to lower population densities.

Therefore, due to its compact area and concentrated population, Mahe stands out as the most densely populated district in the Union Territory of Puducherry.