- Budd Management6
- Budde & Westermann1
- Buffalo Forge Co.1
- Burdett, Paris & Co., Troy Stove Works1
- Burditt & Williams2
- Burdsal, Bros & Co.1
- Burgee, John4
- Burlington Grocery Co.1
- Burnham, Hanna, Munger & Co.1
- Burnside Building Corp.1
- Burrow, King and Co.8
- Butcher's Advocate2
- Butler & Co.1
- Butler Brothers7
- Butler and Baldwin1
- Butler, Broome & Clapp2
- Butte Potato & Produce Co.1
- Byrne and Bowman5
- Byrne, Bowman, and Forshay, Inc.44
- C. & A. Wilder1
- C. A. Barrows1
- C. A. Turner, Incorporated1
- C. Berry & Co.3
- C. C. Webster1
- C. C. Whitmeyer1
- C. E. Roe & Co.1
- C. F. Livingston's Job Printing House1
- C. G. Gunther's Sons2
- C. H. & E. S. Goldberg1
- C. H. Cutting & Co.1
- C. H. Pepper1
- C. J. Blackstone1
- C. Kenyon Co.1
- C. Rasmussen Publishing Co.1
- C. Stewart & Son1
- C. Stolzenbach1
- C. T. Raynolds & Co.3
- C. T. Williamson Wire Novelty Co.1
- C. V. Clickener & Co.2
- C. W. Billings Slate and Wood Mantel Works1
- C. Yaeger & Co.1
- C.H. & L.J. McCormick's Reaper Manufactory1
- CH Construction Corp.1
- CLMC Corp.1
- Cadillac Fairview2
- Cain, Walker O., 1915-19931
- Cajorco Realty Corp.1
- Caledonian Insurance Company1
- California Sugar Refinery1
- California. State Department of Education2
- Calvin-Morris Corp.12
- Cambridge Realty Corp.1
- Campagna Construction Corp.13
- Campagna, Anthony8
- Campagna, Armino A.2
- Campagna, John J.6
- Campagna, Joseph A.2
- Campagna, Michael A.2
- Campbell & Cutler Paint & Glass Co.1
- Campbell & Dick1