Slide 19 of 29
Notes:
A block group within a tribal census tract is referred to as a tribal block group when tribes identified the areas. Where a census tract numbered in the 9400 series crosses a county line, the same tribal block group may be assigned on both sides of that boundary.
When data are provided for American Indian entities, the boundary of a federally recognized American Indian reservation and off-reservation trust land is always the boundary of a tribal census tract. The optimum size for a tribal census tract is 2,500 people, with a minimum of 1,000 people.
A tribal designated statistical area is a statistical entity delineated for the U.S. Census Bureau by a federally recognized American Indian tribe that does not have a federally recognized land base (a reservation or off-reservation trust land). New for Census 2000, a tribal designated statistical area may cross a state line. For the 1990 census, tribal designated statistical areas included state-recognized tribes without a land base; these are now called state designated American Indian statistical areas.
Federal American Indian reservations are areas with boundaries established by treaty, statute, and/or executive or court order, and, along with off-reservation trust lands, are recognized by the federal government as territory in which American Indian tribes have primary governmental authority.
In the map here we can see the American Indian area (or reservation) in light green whose boundaries are that of tribal census tract 9404. In dark green we see various off-reservation trust lands which are contained in single blocks or groups of blocks.
