What is zip code?
US ZIP Codes are type of postal codes used by the United States Postal Service since 1963 to help USPS to route mail more efficiently. The actual term ZIP stands for Zone Improvement Plan and suggests that mail is zipping alone quickly and proficiently. There are for types of zip codes:
- Unique/single high volume address (ex. 20505 for the CIA in Washington, DC)
- PO Box only (ex. 22313 for the PO Boxes of Alexandria, VA)
- Standard (all other ZIP codes)
The basic 5 digit format has been used since 1963 and in 1983 an extended 4 digit code was added to help mail grouping for more specific location.
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Complete list of US States and Canadian provinces including list of all zip codes for each US state and Canadian province with stat and demographics information about each state and province. There are currently 50 states, which are bound together in a union with each other. Four states (Massachusetts, Pennsylvania, Virginia and Kentucky) are officially named a "Commonwealth" rather than a "State." States are divided into counties or county-equivalents. County or county-equivalent structure varies widely by state. Canada is the second-largest country in the world and has ten provinces and three territories. These subdivisions vary widely in both land and water area.
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