- Cross and Brown Co.10
- Cross and Cross5
- Crotona Building Corp.1
- Cruikshank Co.11
- Crystal Window Glass Works1
- Culver Associates, Inc.4
- Culver, Hollyday and Co., Inc.16
- Cumberland Mills1
- Cunningham, Frost & Throckmortons2
- Curry, Tunis & Norwood1
- Curtis & Curtis Co.1
- Curtis & Rickerson1
- Cushing, Bardua & Co.2
- Cushing, Olmsted and Snoss2
- Cushman Bros. Company1
- Cushman and Wakefield, Inc.52
- Cutler & Neilson Paint & Color Co.1
- Cutler Paint & Glass Co.1
- D'Acheul Drug Company1
- D. Auerbach & Sons1
- D. Davis & Sons1
- D. Devlin & Company2
- D. Hodgman & Co.1
- D. Jayne & Son1
- D. N. & E. Walter Co.1
- D. P. Locher & Son, Bankers1
- D. S. Walton & Co.2
- D.J. Hennessy Mercantile Company1
- DBS Associates3
- Dahage Realty Corp.11
- Dahill Gardens, Inc.1
- Dana Hardware Co.2
- Dana, Hyde & Co.2
- Daniel Scotten & Co.2
- Daniels & Fisher1
- Daniels, Cornell & Co.1
- Dater, Whaling & Co. State Mills1
- David Isacowitz and Sons1
- David Kenneth Specter and Associates1
- David S. Foster, Sons & Co.1
- David Trubee & Co.1
- Davis, Brody and Associates5
- Davis, Pitts & Co.1
- Day, Callaghan & Co.2
- De Pace and Juster9
- De Rose and Cavalieri1
- De Wolff & Christiansen3
- DeGolyer Varnish Works1
- DeLong Brothers1
- Decatur & Hopkins Co.1
- Decatur Estates1
- Decatur Towers, Inc.1
- Deegan Building Corp.1
- Delamater Iron Works C. H. Delamatere & Co. Dr.1
- Deming Company1
- Denberg, Louis1
- Denihon, B.J.13
- Denrich Realty Corp.2
- Denton & Wood1
- Der Scutt Architects1