What US Census Numbers Mean

Diana's Genealogy Pages: What Census Numbers Mean: "the column headings for the 1790-1930 U.S. Census Population Schedules, plus some state census and other census schedules. Items are listed in the order they appear on the schedules as columns, left to right. Be aware that there are some differences from state to state, for example, northern states are apt to omit columns for slaves. With regard to immigration, 'Na' means naturalized, 'Al' means alien, and 'Pa' means papers of intent (to become a citizien) have been filed"