- A.F. Development Co., Inc.1
- A.H. Andrews & Co.1
- A.H. Montague & Son2
- A.H. and L. Building Corp.2
- A.M. Bing and Son Realty Corp.4
- A.P.S. Realty Corp.1
- A.S. Barnes & Co.3
- A.T. Demarest & Co.1
- A.Y. McDonald & Morrison Mfg. Co.1
- AMIH Housing Services, Inc.1
- Aaron A. Colter & Co.1
- Aaron Green Co.5
- Aaronson and Heidrich1
- Abbott Hotels1
- Abbott, Karl P.1
- Abe Saul Construction Corp.1
- Abel Bros. & Co.2
- Abel, Smith & Co.1
- Abram French Company2
- Abramowitz, M.L.1
- Abramowitz, Samuel1
- Ackerman, Frederick L.5
- Ackman Brothers1
- Acme Copying Company1
- Adler, Morris Bernard7
- Adrian Builders, Inc.1
- Aetna National Bank1
- Aetna Rubber Co.1
- Affiliated Developers, Inc.2
- Aikin, Lambert & Co.2
- Ajello, G.1
- Akiba Development Corp.1
- Akron Shoe Co.1
- Alabastine Company1
- Alan H. Polkes Associates, Inc.2
- Albemarle Gardens, Inc.1
- Albert B. Ashforth, Inc.36
- Albert Glassman2
- Albert and Harrison, Inc.1
- Alberta Chair Works1
- Alcor Realty Corp.2
- Alderton Co.2
- Alderton Hall, Inc.2
- Alexander Wolf and Co., Inc.49
- Alfred Munroe & Co.1
- All States Terminal Corp.3
- Allaire Works1
- Allentown Manufacturing Co.2
- Allied Realties1
- Allington & Curtis Mfg. Co.1
- Allyn & Blanchard1
- Allyn House1
- Allyn, Blanchard & Latimer1
- Almar Construction Corp.1
- Alna Realty Corp.1
- Alpark Realty Corp.1
- Alsam Realty Corp.1
- Alson Co.4
- Alson Trading Co.1
- Aluminum Novelty Works1