[mx18] Are coded in code 220 (other multi-unit) multifamily dwellings grouped around courtyards (vivienda en vecindad), in code 300 (other type of dwelling) are rooftop rooms (vivienda en cuarto de azotea), while in code 320 (informal dwelling) are dwellings not built for habitation (local no construido para habitación).
[mx18] Are coded in code 100 (owned) litigious proprieties (vivienda intestada o en litigio) and in code 200 (not owned) other forms of tenancy than owned, rented or borrowed dwelling.
[mx18] Refers to localities with less than 2500 inhabitants.