Chatham was a canton (township) in the historical county of Argenteuil.
The canton of Chatham was established on 1 Jul 1855[1]
On 6 Oct 1999, Chatham merged with the village of Brownsburg. This new entity, Brownsburg-Chatham is currently located in the Regional County Municipality of Argenteuil, Laurentides, Québec, Canada.[2]