| England & Wales, National Probate Calendar (Index of Wills and Administrations), 1858-1995 | 20,503,036 |
| London, England, Land Tax Records, 1692-1932 | 12,773,671 |
| London, England, Workhouse Admission and Discharge Records, 1764-1921 | 10,098,399 |
| England & Wales, Criminal Registers, 1791-1892 | 1,556,259 |
| England, Criminal Lunatic Asylum Registers, 1820-1876 | 1,353,900 |
| Web: London, England, Proceedings of the Old Bailey and Ordinary's Accounts Index, 1674-1913 | 1,246,537 |
| UK, Land Tax Redemption, 1798 | 1,179,406 |
| Westminster, London, England, Poor Law Registers, 1561-1900 | 1,077,486 |
| UK, Register of Duties Paid for Apprentices' Indentures, 1710-1811 | 1,045,652 |
| UK, Lunacy Patients Admission Registers, 1846-1921 | 842,355 |
| London, England, Selected Poor Law Removal and Settlement Records, 1698-1922 | 583,354 |
| London, England, Poor Law Hospital Admissions and Discharges, 1842-1918 | 512,961 |
| London, England, Freedom of the City Admission Papers, 1681-1930 | 463,958 |
| Sutton, Surrey, England, Tax Collection Rate Books, 1783-1914 | 320,807 |
| London, England, Poor Law and Board of Guardian Records, 1738-1926 | 319,763 |
| London, England, Overseer Returns, 1863-1894 | 294,833 |
| British Chancery Records, 1386-1558 | 270,554 |
| UK, Registers of Habitual Criminals and Police Gazettes, 1834-1934 | 258,911 |
| London, England, Newgate Calendar of Prisoners, 1785-1853 | 257,953 |
| London, England, Selected Rate Books, 1684-1907 | 186,366 |
| London, England, Wills and Probate, 1507-1858 | 135,186 |
| Sutton, Surrey, England, Water Rate Books, 1868-1911 | 132,935 |
| Kensington and Chelsea, London, England, Poor Law Records, 1695-1921 | 66,501 |
| London, England, Land Tax Valuations, 1910 | 44,374 |
| London, England, King's Bench and Fleet Prison Discharge Books and Prisoner Lists, 1734-1862 | 32,198 |
| London, England, Marshalsea Prison Commitment and Discharge Books, 1811-1842 | 28,849 |
| UK, Royal Navy Medical Journals, 1817-1856 | 28,256 |
| Westminster, London, England, Wills and Probates, 1504-1829 | 16,818 |
| England and Wales, Long-Term Workhouse Inmates, 1861 | 14,273 |
| UK, Licences of Parole for Female Convicts, 1853-1871, 1883-1887 | 4,439 |
| England & Wales, Criminal Lunacy Warrant and Entry Books, 1882-1898 | 4,332 |
| London, England, Gamekeepers' Licences, 1727-1839 | 2,578 |
| Red Book of the Exchequer | 1,756 |
| England, Return of Owners of Land, 1873 | 1,658 |
| England, Suffragettes Arrested, 1906-1914 | 1,339 |
| Newgate Calendar | 1,081 |
| Decisions of the Court of Session 1781-1822 | 982 |
| A calendar of chancery proceedings : bills and answers filed in the reign of King Charles the First | 976 |
| England, Testamenta Vetusta, Illustrations From Wills, Vol I | 932 |
| Genealogical Gleanings in England, Vol. II | 920 |
| Abstracts of inquisitiones post mortem relating to the city of London, returned into the Court of Chancery | 897 |
| Genealogical Gleanings in England, Vol. I | 863 |
| Abstracts of Wills 1620 - Soame | 621 |
| American Wills Proved in London, 1611-1775 | 353 |
| Placita coram domino rege apud Westmonasterium de termino Sancte Trinitatis anno regni regis Edwardi | 343 |
| The Revised Reports: An Index of Cases Vol 1-15 | 338 |
| English Origins of American Colonists | 294 |
| An index to Bills of privy signet, commonly called Signet bills, 1584 to 1596 and 1603 to 1624 | 251 |
| Genealogical memoranda relating to the family of Merriam | 119 |
| Notes on the patroonships, manors and seigneuries in colonial times | 43 |
| Genealogical memoranda relating to the family of Lynch | 16 |