How many small states of present-day Odisha were integrated into the Indian Union at the time of Partition?

The correct option is 26.

Explanation:

At the time of India's independence and partition in 1947, the region of Odisha comprised directly administered districts as well as several princely state territories known as the Odisha Feudatory States (also referred to as the Garhjat states).

Under the leadership of Sardar Vallabhbhai Patel and the efforts of Harekrushna Mahatab, the merger process of these princely states was initiated. A total of 26 small princely states (Garhjats) of Odisha signed the Instrument of Accession to integrate into the Indian Union. Out of these, 24 states officially merged into Odisha on January 1, 1948, while Mayurbhanj joined later on January 1, 1949 (Seraikela and Kharsawan were briefly integrated but later transferred to Bihar).

Thus, 26 small princely states of the Odisha region were integrated into the Indian Union around the time of Partition.