Brillion is a city in Calumet County in the U.S. state of Wisconsin. The population was 3,538 as of 2024. The city is located within the Town of Brillion, though it is politically independent.

Calumet County is a county located in the U.S. state of Wisconsin. As of the 2020 census, the population was 52,442. The county seat is Chilton. The county was created in 1836 and organized in 1850.