Surname B
| SURNAME | TOWNSHIP | RESEARCHER |
| Baade | Kathi Turner | |
| Bagg | Wauconda | Joe Bagg |
| Bahling | Robert LaDean | |
| Bangs | Wauconda | Roger Peterson |
| Barnes | Jim Downer | |
| Barney | Wendy | |
| Bartling | Riverwoods & Highland Park | Perennials@aol.com |
| Barto | Newport & Waukegan | Kathy Stonecipher |
| Baseley | Lake County, 1850 | Janet Baseley Thurman |
| Batcheler | Beth Blote | |
| Bater | Max G. & Donna Kearse | |
| Bayley | 1850-1900 | Bill Jones or Bill Jones or Bill Jones |
| Beebe | Sharon L. Cantrall | |
| Behrens | DSim774700@aol.com | |
| Belzowski | Grayslake | Ed Otrembiak |
| Benjamin | Zion 1920-Present | Nancy Cheesbrough |
| Benson | Chris Fitzgerald | |
| Berry | Libertyville | Tom Fagan |
| Bertulis⁄Bartulis⁄Bartulaitis | Waukegan ca 1907 | Billie Houghland |
| Beverly | Barrington, Ela⁄Cuba; resident 1884-1868 | Virginia M. Barry |
| Bidinger | Waukegan, ca 1900s | Carmel Saxon |
| Bilek | Thelma Kubicek Reukauf | |
| Bils | Waukegan | Tiffany Gideon Bils |
| Blanchard | Sophia Preston | |
| Blanck | Wauconda | Lora Meisner |
| Bliss | Ryerse | |
| Blowney | Waukegan & Warren Twp. | Janice Buchanan |
| Bludorn | Alan Weaver | |
| Bock | Mary Lou Heal Gdowski | |
| Bock | Donna Hlavas | |
| Boni | Susan Boni Reedy | |
| Borawski | Waukegan, 1924-1984 | Ruth Suchanski Kelly |
| Borke | Antioch | Joey Clarke-Jordan Van Us |
| Bosworth | Zion | Cynthia Solem |
| Bracher | Warren & Libertyville Twps. | Barbara Mivshek |
| Bradley | Ruth Streed Filstead | |
| Braeckman | Antioch | Denise Parsons |
| Bragg | Kildeer | Midge Corcoran |
| Brauck | Ruth Streed Filstead | |
| Brean | Therese Ives | |
| Brewer | Candie Hirak-Horrell | |
| Brewer | Stephanie Sampson | |
| Brock | dkhmom | |
| Brogan | Antioch | Lee Koenig |
| Brown | Newport - 1850's to 1880 | Doni Wright |
| Brown | Waukegan & Warren Twp | Jan Buchanan |
| Bulkley | Hazel Bulkley | |
| Butler | Jim Lee | |
| Buxbaum | Kathy Williams |