- Bagley, Grace Hodges, 1860-194412
- Bagley, John, 1875-193821
- Bagley, Mary, 1878-196921
- Bailey & Noyes1
- Bailey, Lionel M.1
- Bailey, Vernon Howe, 1874-19531
- Bainbridge Towers, Inc.1
- Bainweeks Realty Corp.1
- Baird, Frances, 1900-199624
- Baird, Theodore, 1901-24
- Baker Bottling Works1
- Baker, Frank, 1864-192227
- Baker, Gayle, 1881-27
- Baker-Lewine Construction Co., Inc.2
- Balch, Nonie, 1867-19328
- Balch, Oscar, 1869-19558
- Balcom, Benjamin1
- Baldauf, Anette1
- Baldwin & Howell1
- Baldwin Gardens, Inc.2
- Baldwin the Clothier2
- Baldwin, Hiram, 1857-191671
- Baldwin, Jesse, 1854-192111
- Baldwin, Mary, 1859-193711
- Ball, Black & Co.1
- Balter and Greenberg1
- Baltimore Bargain House3
- Baltimore Pearl Hominy Mills1
- Bandes Development1
- Bandes-Stillman Development2
- Bandini, Arturo1
- Bandon, Phillippe1
- Banham, Reyner3
- Bank of Commerce1
- Bankers Trust Company1
- Banner Milling Co.1
- Baraka, Amiri, 1934-20141
- Barbee Wire & Iron Works1
- Barber, Benjamin R., 1939-20172
- Barber, Donn1
- Barclay Plaza Apartments, Inc.1
- Barclay Plaza Association5
- Bardon Realty Corp.1
- Barg Estates, Inc.1
- Bargmann, Julie1
- Barguard Building Corp.1
- Bargut Realty Co., Inc.1
- Barjo Homes, Inc.1
- Barker Bros.1
- Barker Realty Corp.1
- Barkin, Samuel1
- Barlau Estates, Inc.1
- Barlow, Alfred E., 1855-19261
- Barmont Realty Corp.1
- Barnaby Realty and Construction Co.1
- Barnaby-Sutton Realty Co.2
- Barnard, George Grey, 1863-19384
- Barnard, Sumner, and Putnam Company1
- Barnes & Park1
- Barnes, Charles, 1860-193311