Sunday, April 17, 2016


The United States Postal Service, which assigns zip codes, has issued about 45,000 of the 99,999 possible zip code values. Some zip codes, however, have no residents, such as a code assigned to a single large office building. The United States Census Bureau compiles statistics on nearly 32,000 regions it calls Zip Code Tabulation Areas, distinct areas approximating the boundary of a geographic postal zip code. With a total U.S. population of over 300 million, each tabulation area thus contains an average of roughly 10,000 people.

Charles, P. P., Shari L. P., Jonathan M. (2015). Security in Computing: Fifth Edition (pp. 615). Prentice Hall. Upper Saddle River, NJ

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