After India's independence, it was included in PEPSU and later in the Indian East Punjab after the States Reorganisation Act, 1956.

The area of Kalsia is now located in the modern day Indian states of Punjab and Haryana.

[2] The area of Kalsia was 435 km2 (168 sq mi), consisting of 20 detached pieces of territory in the Ambala and Ferozepur districts, lying mainly between 30° 12 and 30° 25 N and 77° 21 and 77° 35 E.[3] It was divided into 3 major parts: two tehsils, Chhachhrauli and Basi, and a sub-tehsil named Chirak, in Ferozepur district.

At that time the area of Kalsia state comprised the territory between the Yamuna and the Markanda stream.

In recognition of his services, Ranjit Singh presented him territories of Badala, Kameri and Chhabbal.

Raja Ravi Sher Kalsia Hospital was inaugurated in 1910 by Lt Governor of the Punjab, Sir Luis William Daney.

In volume XIX (Part 1) of the Census of India 1891, E. D. Maclagan, the Provincial Superintendent of Census Operation, records: "Some eighty years ago (i.e., in 1811 AD) the grandfather of the present Lambardar of Jainpur village was carried off by the Sikh chief of Kalsia, and had all his fingers burnt off, because he refused to acknowledge that Nanak was the true Guru.