Brillion is a city in Calumet County in the U.S. state of Wisconsin. The population was 2,937 at the 2000 census. The city is located within the Town of Brillion, though it is politically independent.
Brillion is located at 44°10′30″N 88°3′57″W / 44.175°N 88.06583°W / 44.175; -88.06583 (44.175114, -88.0661).
According to the United States Census Bureau, the city has a total area of 2.6 square miles (6.7 km²). None of the area is covered with water.