Changyi (Chinese: 昌邑; pinyin: Chāngyì) is a county-level city of Weifang, Shandong province, People's Republic of China. The city is 1627.5 square kilometers in area, with a household population of 581,000 as of 2010. The city is under the administration of the Changyi Municipal People's Government, with three neighborhoods, six towns, 691 administrative villages, and one special economic development zone. Changyi has a long history that extends back into the Spring and Autumn period.