The overwhelming majority of Lahore and West Punjab's non-Christian minority population fled to India at Partition, while East Punjab was similarly depopulated of almost its entire Muslim population. For example, on the eve of Partition, Amritsar was about 49% Muslim, whereas in the 1951 census, the figure had dropped to only 0.52%, while Ludhiana was 63% Muslim prior to Partition, but 97% Hindu and Sikh in the 1961 census.
Most of Lahore and West Punjab's non-Christian minority population left for India at the time of Partition, while East Punjab suffered a similar loss of its entire Muslim population. To illustrate, Amritsar was roughly 49% Muslim before Partition, whereas by the 1951 census, this number had plummeted to just 0.52%, whereas Ludhiana was predominantly Muslim prior to Partition but became almost entirely Hindu and Sikh in the 1961 census.