Metropolitan area codes: 1963-1967
- 00001
- New York, NY
- 00002
- Chicago, IL
- 00003
- Philadelphia, PA
- 00004
- Los Angeles, CA
- 00005
- Detroit, MI
- 00006
- San Fransisco, CA
- 00007
- Boston, MA
- 00008
- Cleveland, OH
- 00009
- St. Louis, MO-IL
- 00010
- Pittsburg, PA
- 00011
- Washington, DC-MD-VA
- 00012
- Baltimore, MD
- 00013
- Houston, TX
- 00014
- Minneapolis-St. Paul, MN
- 00015
- Buffalo, NY
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