Metropolitan area codes: 1973-1975
- 00001
- New York, NY
- 00002
- Los Angeles - Long Beach, CA
- 00003
- Chicago, IL
- 00004
- Philadelphia, PA
- 00005
- Detroit, MI
- 00006
- San Fransisco - Oakland, CA
- 00007
- Washington, DC-MD-VA
- 00008
- Boston, MA
- 00009
- Nassau-Suffolk, NY
- 00010
- Pittsburg, PA
- 00011
- St. Louis, MO-IL
- 00012
- Baltimore, MD
- 00013
- Cleveland, OH
- 00014
- Houston, TX
- 00015
- Newark, NJ
- 00016
- Minneapolis-St. Paul, MN
- 00017
- Dallas, TX
- 00018
- Seatle-Everett, WA
- 00019
- Anaheim-Santa Ana-Garden Grove, CA
- 00020
- Milwaukee, WI
- 00021
- Atlanta, GA
- 00022
- Cincinnati, OH
- 00023
- Patterson-Clifton-Passaic, NJ
- 00024
- San Diego, CA
- 00025
- Buffalo, NY
- 00026
- Miami, FL
- 00027
- Kansas City, MO-KS
- 00028
- Denver, CO
- 00029
- San Bernardino-Riverside-Ontario, CA
- 00030
- Indianapolis, IN
- 00031
- San Jose, CA
- 00032
- New Orleans, LA
- 00033
- Tampa-St. Petersburg, FL
- 00034
- Portland, OR-WA
- 00036
- Phoenix, AZ
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