Division No. 4, Alberta  Division No. 4 is a census division in Alberta, Canada. It is located in the northeast corner of southern Alberta and its largest urban community is the Town of Hanna. Division No. 4 is the smallest census division in Alberta according to population. The following census subdivisions (municipalities or municipal equivalents) are located within Alberta's Division No. 4. In the 2011 Census, Division No. 4 had a population of 10,078 living in 3,900 of its 4,274 total dwellings, a -4.9% change from its 2006 population of 10,600. With a land area of , it had a population density of 0.5 people per square kilometre in 2011. In 2006, Division No. 4 had a population of 10,600 living in 4,295 dwellings, a -6.2% increase from 2001. The census division has a land area of and a population density of 0.5 inhabitants per square kilometre.