Abdullah, Dato' Maharajalela and other Malay chieftains who plotted to kill J. W. W. Birch, the first British Resident of Perak. The meeting was held in Durian Sebatang. Birch was later killed in Pasir Salak while bathing in the river.
The last major engagement during the Malayan Emergency was fought in the marshes near Teluk Intan in 1958, and ended with the surrender of the local Malayan Races Liberation Army forces to government forces.
By the early 1980s the town was the third largest town in Perak. Teluk Intan served as the major administrative and business settlement for smaller neighbouring towns such as Tapah, Bidor, Bagan Datoh and Hutan Melintang. Until the mid-1990s Sabak Bernam, a town in the neighbouring state of Selangor, also dependeded on Teluk Intan for most of their basic services. Even their telephone area code was registered using Perak's area code of +605 instead of +603 that is used in Selangor. Acute medical cases would be transferred to Teluk Intan Hospital as their hospital did not have the equipment or expertise.
As the Perak River became shallower each year due to upstream erosion and silt deposition near Teluk Intan, the town lost its two most important roles in Perak's economy which was being an export harbour for tin and rubber and as a petroleum distribution centre for Shell Malaysia. This is because big oil tankers and cargo ships were no longer able to sail into the town's port. By the end of the 1980s, Shell Malaysia transferred their petroleum storing facilities to the coastal town of Lumut in Manjung, located 60 km from Teluk Intan. As the economic activity declined, it also lost its railway facilities which connected the town with Tapah and the national railway network.
During the 1990s, economic activities in Teluk Intan continued to decline. This situation forced the younger generation to migrate to bigger cities such as Ipoh, Kuala Lumpur, Klang and Shah Alam in search of better jobs
