[3] The word Mississauga is an anglicized version of the Ojibwe word Misswezaagiing, which means ‘a river with many outlets.’ This name comes from the Mississagi River, which is a bird-foot delta, a haven for fish and waterfowl and is currently a jointly managed Provincial Park.

The people of Mississaugi have resided there since time immemorial.

In 2015, it also adopted the Misswezahging Constitution, which noted that the community had the "inherent right given by the Creator to enact laws necessary in order to protect and preserve Anishinaabe culture, to protect our lands, our language, customs, traditions and practices."

A court in Elliot Lake accepted a guilty plea from an individual for trespassing and failing to comply with an order to leave the community.

Police had refused to prosecute using the community's legal code, so a lawyer was hired using funds from a government pilot project for private prosecution of Indigenous communities' legal codes.