Brownsburg-Chatham is located along the Ottawa River, just west of Lachute, and includes the communities of Brownsburg, Cushing, Dalesville, Greece's Point, Pine Hill, and Saint-Philippe.

Mostly populated by rich American Loyalists, its post office opened in 1829 and the township municipality was formed in 1845.

[1] In 1818, Major George Brown, born in England, was granted by the government land on the West River (Rivière de l'Ouest).

Together with pioneers Daniel Smith and Captain A. L. Howard, he was able to breathe life into the local industry during the 1820s.

George Brown built, among other achievements, a sawmill and gristmill which contributed to the economic growth of the region and led to the formation of Brownsburg village which was named after him.