area_code area_name 0000 U.S. city average 0100 Northeast 0110 New England 0120 Middle Atlantic 0200 Midwest 0230 East North Central 0240 West North Central 0300 South 0350 South Atlantic 0360 East South Central 0370 West South Central 0400 West 0480 Mountain 0490 Pacific A104 Pittsburgh, PA A105 Buffalo-Niagara Falls, NY A106 Scranton, PA A210 Cleveland-Akron, OH A212 Milwaukee-Racine, WI A213 Cincinnati-Hamilton, OH-KY-IN A214 Kansas City, MO-KS A311 Washington-Baltimore, DC-MD-VA-WV A315 Washington, DC-MD-VA A317 Baltimore, MD A421 Los Angeles-Riverside-Orange County, CA A425 Portland-Salem, OR-WA B000 City size B B100 Northeast size B B200 North Central size B B300 South size B B400 West size B C000 City size C C100 Northeast size C C200 North Central size C C300 South size C C400 West size C D000 Size Class D D100 Northeast - Size Class D D200 Midwest - Size Class D D300 South - Size Class D D400 West - Size Class D N000 Size Class B/C N100 Northeast - Size Class B/C N200 Midwest - Size Class B/C N300 South - Size Class B/C N400 West - Size Class B/C S000 Size Class A S100 Northeast - Size Class A S11A Boston-Cambridge-Newton, MA-NH S12A New York-Newark-Jersey City, NY-NJ-PA S12B Philadelphia-Camden-Wilmington, PA-NJ-DE-MD S200 Midwest - Size Class A S23A Chicago-Naperville-Elgin, IL-IN-WI S23B Detroit-Warren-Dearborn, MI S24A Minneapolis-St.Paul-Bloomington, MN-WI S24B St. Louis, MO-IL S300 South - Size Class A S35A Washington-Arlington-Alexandria, DC-VA-MD-WV S35B Miami-Fort Lauderdale-West Palm Beach, FL S35C Atlanta-Sandy Springs-Roswell, GA S35D Tampa-St. Petersburg-Clearwater, FL S35E Baltimore-Columbia-Towson, MD S37A Dallas-Fort Worth-Arlington, TX S37B Houston-The Woodlands-Sugar Land, TX S400 West - Size Class A S48A Phoenix-Mesa-Scottsdale, AZ S48B Denver-Aurora-Lakewood, CO S49A Los Angeles-Long Beach-Anaheim, CA S49B San Francisco-Oakland-Hayward, CA S49C Riverside-San Bernardino-Ontario, CA S49D Seattle-Tacoma-Bellevue WA S49E San Diego-Carlsbad, CA S49F Urban Hawaii S49G Urban Alaska