From introduction: The 1790 Spanish colonial census of the Province of New Mexico, together with the 1823 and 1845 Mexican census of the are, provides a valuable genealogical tool for research on early New Mexican families. The original enumerations were for tax purposes, but their historic value is tremendous. Although each census is fragmentary with many communities missing, the combined censues constitute a primary source for locating original homes of the colonial families of New Mexico.