With the partition of India, the Punjab province was to be divided in two as per the Indian Independence Act 1947, passed by the parliament of the United Kingdom.

The northeast Hill States of the Punjab Province banded together and were declared a union territory in 1950 as Himachal Pradesh.

At the same time, some parts of the former territory of Patiala and East Punjab States Union, including Solan and Nalagarh, were transferred to Himachal Pradesh.

Below is the religious demographics of this region broken down by district and princely state with an overall total as per the 1901 Indian census.

Below is the religious demographics of this region broken down by district and princely state with an overall total as per the 1911 Indian census.

Below is the religious demographics of this region broken down by district and princely state with an overall total as per the 1921 Indian census.

Below is the religious demographics of this region broken down by district and princely state with an overall total as per the 1931 Indian census.

[26] Terms East and West Punjab are also often used in modern India and Pakistan when making a comparison between the two territories.