On August 13, 1982, Baguio City, Benguet Province and Hangzhou City, Zhejiang Province established Sister-City relations in Hangzhou.

On October 20, 2002, Ilocos Norte Province and Shandong Province established Sister-Province relations in Jinan, Shandong Province.

On October 25, 2005, Laoag City, Ilocos Norte Province and Laibing City, Guangxi Zhuang Autonomous Region established Sister-City relations in Nanning.

On August 21, 2009, Pangasinan Province and Sichuang Province established intent of Sister-Province relations in Chengdu, Sichuang Province.

On December 3, 2019, Ilocos Sur Province and Hubei Province established Sister-Province relations in Vigan, Ilocos Sur Province.

On May 24, 2023, Tuguegarao City, Cagayan Province and Huzhou City, Zhejiang Province established Sister-City relations in Huzhou.

On June 9, 2023, Laoag City, Ilocos Norte Province and Huangshan City, Anhui Province established Sister-City relations in Hushan.

On June 25, 2023, Dagupan City, Pangasilan Province and Dongshan County of Zhangzhou City, Fujian Province established Sister-City relations online.