Spell out all city and state names. Don’t abbreviate city names.
Per AP Style, all US 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 the whole country name, on further mentions use the common abbreviation.