What is the pattern to this list: Boston, MA New York, NY Philadelphia, PA Cleveland, OH Richmond, VA...

trivia/federal.reserve

Problem

What is the pattern to this list:
Boston, MA
New York, NY
Philadelphia, PA
Cleveland, OH
Richmond, VA
Atlanta, GA
Chicago, IL
St. Louis, MO
Minneapolis, MN
Kansas City, MO
Dallas, TX
San Francisco, CA

Show solution

Each of the cities is a location for a Federal Reserve.  The cities
are listed in alphabetical order based on the letter that represents each
city on a dollar bill.