The township comprises the communities of Benoit, Bradley Creek, Caledonia Springs, Fenaghvale, Forest Park, Fournier, Franklins Corners, Gagnon, Johnsons Ferry, Lalonde, Limoges, Longtinville, Martels Corners, Mayerville, Parkers Corners, Proulx, Riceville, Routhier, Sandown, Skye, St. Albert, St. Amour, St. Bernardin, Ste-Rose-de-Prescott, St. Isidore and Velfranc.
The ghost town of Lemieux, abandoned in the early-1990s, is also located within the municipality.
The Nation experienced significant growth between 2006 and 2011. According to the 2011 Statistics Canada census, The Nation's population is 11,668, a 9.4% increase from 10,643 in 2006. There are more than 4,400 dwellings in 658.03 km² with the average population density per km² being 17.7.
The Nation also contains one of the larger concentrations of the French in Ontario. According to the 2006 Statistics Canada census, 70% of the population have French as their first language, while 25% have English as their first language.