The object returned by
readUSstateAbbreviations() on May 20,
data.frame containing 10 different character vectors of names
or codes for 76 different political entities including the United
States, the 50 states within the US, plus the District of Columbia, US
territories and other political designation, some of which are
obsolete but are included for historical reference.
The standard name of the entity.
description of status, e.g., state / commonwealth vs. island, territory, military mail code, etc.
Alternative abbreviations used per different standards. The most
commonly used among these may be the 2-letter codes officially
used by the US Postal Service (
This was read from the Wikipedia article on "List of U.S. state abbreviations"
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