Essex Junction is a city in Chittenden County, Vermont, United States. As of the 2020 U.S. census, the population was 10,590. It was incorpora…Essex Junction is a city in Chittenden County, Vermont, United States. As of the 2020 U.S. census, the population was 10,590. It was incorporated as a village on November 15, 1892. Essex Junction became Vermont’s 10th city on July 1, 2022.