Census Bureau recognizes and tabulates data separately only for the inhabited off-reservation trust lands; on-reservation trust lands are included as part of the reservation. As with American Indian reservations, the trust lands of a tribe or individual may cross State boundaries. Not all Federal reservations have trust lands associated with them, and there are no trust lands recognized for State reservations. The Census Bureau first reported data for tribal trust lands in conjunction with the 1980 census and for individual trust lands in conjunction with the 1990 census. The BIA provided the Census Bureau with maps identifying the trust land boundaries.
Tribal jurisdiction statistical areas (TJSAs) are delineated by those Federally recognized tribes in Oklahoma that no longer have a reservation. The territory covered by a TJSA contains the American Indian population over which a tribal government has jurisdiction. In situations where two tribal governments claim the same territory, the Census Bureau created a joint use area to represent the geographic overlap, and treated it as a separate TJSA for data presentation purposes. The TJSAs replace the Historic Areas of Oklahoma used in conjunction with the 1980 census (see subsection, “The 1980 Census”).
Tribal designated statistical areas (TDSAs) are geographic entities delineated by Federally and State-recognized tribes without a land base, that is, with no reservation or trust lands. In general, a TDSA consists of (1) territory that contains the American Indian population over which a Federally recognized tribe has jurisdiction or (2) territory within which a State-recognized tribe provides benefits and services to its members. TDSAs must conform to Census Bureau criteria: they cannot overlap onto reservations or trust lands, they cannot cross State lines, and their boundaries must follow established census block boundaries. There are no TDSAs in Oklahoma, where tribal jurisdiction statistical areas (TJSAs) fulfill a similar function as geographic entities for data tabulation and presentation. The Census Bureau recognized TDSAs for the first time in conjunction with the 1990 census.
