威省
After Malaya gained independence in 1957, "Province Wellesley" was renamed Seberang Perai. The Butterworth and Bukit Mertajam town councils were merged into the surrounding rural district councils in 1961, and between 1973 and 1976, the remaining three rural district councils were amalgamated into the Seberang Perai Municipal Council. On 16 September 2019, Malaysia Day, Seberang Perai became a full city of its own. Following this latest amalgamation of the local councils, all of Seberang Perai are administered under a single local government, making the Seberang Perai City Council the biggest local government in Malaysia in terms of land size.