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 | | Block “Census blocks are areas bounded on all sides by visible features, such as streets, roads, streams, and railroad tracks, and by invisible boundaries, such as city, town, township, and county limits, property lines, and short, imaginary extensions of streets and roads. |
 | | Census Tract “Census tracts are small, relatively permanent statistical subdivisions of a county [
].” “When first delineated, census tracts are designed to be homogeneous with respect to population characteristics, economic status, and living conditions. |
 | | The spatial size of census tracts varies widely depending on the density of settlement.” All Block Numbering Areas of 1990 are census tracts in 2000. |
| www.unc.edu /~leverg/tlamaps/overheads.doc (4728 words) |
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