Glossary of economics research
Results of search for tract follow:
tract:
A geographical unit of the U.S. defined by the U.S. Census Bureau, usually
having between a population between 2500 and 8000. Zip codes are about five
times larger. Census-defined "blocks" are a smaller unit than tracts.
Source: Working paper by Joel Elvery; it cites on these questions this
book:
U.S. Dept of Commerce, Bureau of the Census. Geographic Areas Reference
Manual. 1994. Washington, DC.
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