 In the 2011 Census, Cardston County had a population of 4,167 living in 1,032 of its 1,171 total dwellings, a 3.2% change from its 2006 population of 4,037.With a land area of , it had a population density of in 2011.The population of Cardston County according to its 2008 municipal census is 4,266.