- Campbell, Miller & Associates, cartographer1
- Carlson, John Edward, 1919-1
- Cathcart, Ken G.1
- Central Land Company (Oakland, Calif.)1
- Chandler, Bourn & Miller, publisher1
- Chapman, Alan Daniel1
- Chezar, Henry1
- Citizens Transportation Committee of San Francisco, cartographer1
- City Graphics of America, Inc., cartographer, publisher1
- Clapp, C. H. (Charles Horace), 1883-1935, cartographer1
- Clark, Lorin D.1
- Clark, Percy H., publisher1
- Clason Map Co., cartographer, publisher1
- Clemens-Knott, Diane1
- Compton, H. T., cartographer1
- Congdon, Charles H.1
- Contra Costa County Title Company1
- Cram, George Franklin, 1841-19281
- Culver, Alex, publisher1
- D., H. C.1
GeoBlacklight version 4.1.0
