| Title | Category | Subcategory | Records |
|---|---|---|---|
| Billingshurst Burials and Probate | Life Events (BMDs) | Parish Burials | 5,616 |
| Billingshurst Marriages | Life Events (BMDs) | Parish Marriages | 4,932 |
| Birmingham City Battalions 1914-1918 | Armed Forces & Conflict | First World War | 3,921 |
| Birmingham Employers Roll Of Honour 1914-1918 | Armed Forces & Conflict | First World War | 21,056 |
| Bisbee, Arizona, Evergreen Cemetery Interment Index, 1884-1999 | Life Events (BMDs) | Civil Deaths & Burials | 15,045 |
| Blairs Cyclopaedia Of Australasia | Newspapers, Directories & Social History | Social History | 809 |
| Bolivia Baptisms 1560-1938 | Life Events (BMDs) | Parish Baptisms | 2,853,135 |
| Bolivia Deaths 1750-1920 | Life Events (BMDs) | Parish Burials | 43,584 |
| Bolivia Marriages 1630-1940 | Life Events (BMDs) | Parish Marriages | 726,306 |
| Book Of Deeds Of Manumissions Of Slaves, 1774-1792 (Kent, Pennsylvania) | Institutions & Organisations | Courts & Legal | 848 |
| Boston Births and Baptisms, 1630-1699 | Life Events (BMDs) | Civil Births | 11,979 |
| Boston Births, 1630-1849 | Life Events (BMDs) | Civil Births | 4,368 |
| Boston Deaths, 1630-1825 | Life Events (BMDs) | Civil Deaths & Burials | 85,394 |
| Boston Pilot Newspaper Information Wanted Ads | Travel & Migration | Migration | 41,249 |
| Boyd's Inhabitants Of London & Family Units 1200-1946 | Census, Land & Surveys | Surveys | 583,158 |
| Boyd's London Burials | Life Events (BMDs) | Parish Burials | 242,635 |
| Bradford Pals 1914-1918 | Armed Forces & Conflict | First World War | 1,554 |
| Brandon, Manitoba, Canada, Estate Index, 1884-1984 | Life Events (BMDs) | Wills & Probate | 29,790 |
| Brazil Baptisms 1688-1935 | Life Events (BMDs) | Parish Baptisms | 2,701,184 |
| Brazil Deaths 1750-1890 | Life Events (BMDs) | Parish Burials | 26,932 |