Cassville is a village in Grant County, Wisconsin, United States.

In 1820, Henry Schoolcraft observed a Meskwaki village consisting of twelve substantial log lodges and cultivated fields in the locality.

[6] The Euro-American settlement of Cassville began in 1827, when Judge John Sawyer of Illinois established a smelting furnace to serve lead miners who were expanding northward from Galena, Illinois.

[7] By the early 1830s, Cassville held several log cabins, a tavern, a general store, and a blockhouse constructed during the Black Hawk War.

[8] Cassville experienced a brief boom in 1836, when real estate speculators incorrectly bet that the river landing would become the capital city of the newly established Wisconsin Territory.

A group of investors from Albany, New York, doing business as Daniels, Denniston & Co., purchased most of the town site.

[9] Cassville's failure to become capital, combined with the Panic of 1837, caused an abrupt halt in the town's growth, and much of the land was locked in legal disputes for the following decade.

[10] Nelson Dewey settled in Cassville in 1836 as a clerk for Daniels, Denniston & Co.[11] He later became first Governor of Wisconsin from 1848-1852.

Following his term as governor, Dewey invested in the completion of the Denniston House as a hotel in the 1850s and promoted Cassville's development, albeit with only limited success.

[12] Dewey established his personal estate, Stonefield, on the north side of Cassville in the 1860s.

[19] The Cassville Municipal Airport is located 1 mile southeast of the village, along the banks of the Mississippi River.