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| | STF 1 - 1990 APPENDIX A |
 | | BLOCK Census blocks are small 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 numbers range from 0001 through 9499.99 and are unique within a county (numbers in the range of 9501 through 9989.99 denote a block numbering area). |
 | | Census County Division Census county divisions (CCD's) are subdivisions of a county that were delineated by the Census Bureau, in cooperation with State officials and local census statistical areas committees, for statistical purposes. |
| txsdc.utsa.edu /reference/techdocs/stf1_90/append_a.php (8737 words) |
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