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 Individual trust lands See American Indian trust land.

Intermediate/middle school district A school district inclusive of the fifth through eighth grade, the sixth through the ninth grade, the seventh and eighth grades, or the seventh through ninth grade. The Census Bureau did not provide a separate identification of intermediate/middle school districts in its 1990 census tabulations. See also elementary district, independent district, school district, secondary district.

Internal point A coordinate value for a point that lies within its geographic area; where possible, the internal point also is a centroid. See also centroid.

Island An area of land totally surrounded by water; a type of nonfunctioning county equivalent in American Samoa and the Virgin Islands of the United States; a type of nonfunctioning MCD equivalent in American Samoa.

Joint use area (American Indian) Territory that is administered jointly and/or claimed by two or more American Indian tribes.

Jump The process by which the Census Bureau includes qualifying territory (that is, territory with a population density of at least 1,000 people per square mile) in an urbanized area (UA) when that territory is not adjacent to the main body of the UA. The non-adjacent qualifying territory must be connected to the main body of the UA either by roads or other transportation arteries; these arteries may be no more than 1.5 miles in combined length over developable land, or no more than 5 miles in combined length over water or undevelopable territory. See also adjacent, jump corridor, population density, undevelopable land, urbanized area.

Jump corridor Territory forming a corridor along the transportation artery(ies) connecting non-adjacent qualifying territory to the main body of an urbanized area (UA). For the 1990 census, the jump corridor, together with the qualifying territory that was not adjacent to the main body of the UA, had to have a population density of at least 500 people per square mile. See also adjacent, jump, population density, urbanized area. G-30Glossary