States, cities and countries
Spell out all city and state names. Don’t abbreviate city names.
Per AP Style, all cities should be accompanied by their state, with the exception of:
Atlanta, Baltimore, Boston, Chicago, Cincinnati, Cleveland, Dallas, Denver, Detroit, Honolulu, Houston, Indianapolis, Las Vegas, Los Angeles, Miami, Milwaukee, Minneapolis, New Orleans, New York, Oklahoma City, Philadelphia, Phoenix, Pittsburgh, St. Louis, Salt Lake City, San Antonio, San Diego, San Francisco, Seattle, Washington.
On first mention, write out United States. On subsequent mentions, US is fine. The same rule applies to any other country or federation with a common abbreviation (European Union, EU; United Kingdom, UK).