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A.7.2. Abbreviations

A.7.2.1. The United States

As a noun appearing alone, use "United States."
...the government of the United States...
As a noun appearing as part of a locality, use "US" with no periods and no spaces.
Raleigh, NC, US
As an adjective, use "U.S." with no spaces.
...the U.S. government...
A.7.2.1.1. States
Spell out state names when they appear alone.
...the government of North Carolina...
When abbreviating state names, use their two-letter ZIP standard abbreviations., Abbreviate state names when they appear as part of a locality.
Raleigh, NC
Place one comma between the city and state name and another after the state name, unless it ends the sentence or is part of a dateline.
...founded in Raleigh, NC, by Red Hat...
...managed from Raleigh, NC.