Originally part of a larger county called Iowa (not to be confused with the state). Named by the legislature of Wisconsin territory, approved Dec.8, 1836.

Description from John W. Hunt's 1853 Wisconsin Gazetteer: "GREEN, County, is bounded on the north by Dane, on the east by Rock, on the south by the State line, and on the west by Iowa and Lafayette, and is 4 townships, or 24 miles square. It was set off from Iowa, Dec. 7, 1836... The seat of justice is at Monroe, about 7 miles south from the centre of the county. The soil in the northern part is generally a sandy loam, and in the south mostly prairie, with a subsoil of clay, and is very productive, being adapted to all the purposes of tillage and grazing. It is well watered by the Peckatonnica and Sugar rivers and their branches, and is well apportioned between meadow, prairie and timbered lands. ¿ The mineral region extends east nearly through this county, and several valuable lodes are being worked. The population in 1840 was 933; 1842, 1,594; 1846, 4,758; 1847, 6,487; 1850, 8,583. Dwellings, 1,487; farms, 805; manufactories, 46."

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Green County, Wisconsin

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[Source: Butterfield, History of Green Co.]