First station[]
- Date: March 15, 1922-August 21, 1923
- Frequency:
- 833 khz (March 15, 1922-August 21, 1923)
- Location:
- Altadena, California (March 15, 1922-August 21, 1923)
- Owner of license:
- Altadena Radio Laboratory (March 15, 1922-August 21, 1923)
Second station[]
- Date: January 8, 1924-June 15, 1945... ( Note: One source gives January 22, 1924 as start date.)
- Frequency:
- 960 khz (...June 30, 1924...) (according to one source, but see below)
- 790 khz (January 8, 1924-January 12, 1925)
- 1000 khz (January 12, 1925-March 26, 1925)
- 830 khz (March 26, 1925-June 15, 1927)
- 780 khz (June 15, 1927-November 11, 1928)
- 790 khz (November 11, 1928-March 29, 1941)
- 810 kHz (March 29, 1941...)
- Location:
- Oakland, California (...June 30, 1924-October, 1929) ( NOTE: One listing dated January 31, 1928 shows station already in San Francisco.)
- San Francisco, California (October, 1929-March 29, 1941...)
- Owner of license:
- General Electric Co. (...June 30, 1924-December 23, 1941)
- RCA (December 23, 1941-February 1, 1942)
- Blue Network Company (February 1, 1942-October 12, 1943)
- American Broadcasting System, Inc. (October 12, 1943-June 15, 1945)
- American Broadcasting Co. (June 15, 1945...)
Affiliated with:
KGO-TV[]
- Date: May 5, 1949...