- Asher Dann and Sons, Inc.4
- Ashley Apartments, Inc.4
- Ashton, Dore1
- Ashwood Realty Corp.1
- Askew, Laurin B.1
- Associate Architects1
- Assopiastrelle9
- Astor House14
- Astor, Vincent10
- Astoria Associates, Inc.1
- Atchison Foundry Works1
- Atholl Corp.1
- Atlantic Coast Lumber Co.1
- Atlantic Hotel2
- Atlantic Manufacturing Company1
- Atlantic Paint Co.1
- Atlantic Screw Works1
- Atlantic Towers, Inc.3
- Atlas Terminals, Inc.1
- Atlas and Son1
- Atlas, Sol G.13
- Atwood, Charles B. (Charles Bowler), 1849-189523
- Aubé, Jean-Paul 1837-19161
- Auer, James1
- Aug. Steffen1
- August F. Richter1
- Augustus Pollack1
- Austin Building Corp.1
- Austin Gardens Realty Corp.1
- Austin Management Corp.1
- Austin, Nichols & Co.7
- Auten, Philip L1
- Automatic Vaudville Parlor1
- Avalon Terrace, Inc.1
- Avecrest Realty Co., Inc.1
- Avenue A Apartments Inc.1
- Avenue Associates7
- Avenue Hotel1
- Avery, Snell & Co.1
- Avlon, John4
- Axelrod-Walker Corp.3
- B and F Realty Corp.1
- B. & J. Saylor1
- B. E. Block & Bros. Inc.1
- B. Fischer & Co., Inc.5
- B. Gloeckner & Co. Inc.1
- B. M. Ford & Co,1
- B. McDougall & Son (Firm)1
- B. U. Young & Co.1
- B. and I. Realty Corp.1
- B.G.R. Realty Corp.1
- B.H.M. Realty Corp.1
- BBC Radio 32
- Babb, Cook & Willard1
- Babor-Comeau and Co., Inc.2
- Bach, Anna, 1880-197516
- Bach, Emil, 1876-195616
- Bach, Johann Christian, 1735-17821
- Bach, Johann Sebastian, 1685-17507
- Bagley, Frederick, 1860-193312