Green County is a county located in the U.S. state of Wisconsin. As of the 2020 census, the population was 37,093. Its county seat is Monroe. Green County is included in the Madison, WI Metropolitan Statistical Area.

Monroe, known as "the Cheese Capital of the USA", is a city in and the county seat of Green County, Wisconsin, United States. The population was 10,661 at the 2020 census. The city is bordered by the town of Monroe to the north and the town of Clarno to the south. Monroe is a part of the Madison Metropolitan Statistical Area