| U.S., City Directories, 1822-1995 | 1,385,585,010 |
| U.S., School Yearbooks, 1900-2016 | 881,226,624 |
| U.S., Public Records Index, 1950-1993, Volume 1 | 418,676,061 |
| U.S., Public Records Index, 1950-1993, Volume 2 | 402,455,532 |
| U.S., Index to Public Records, 1994-2019 | 330,831,862 |
| U.S., Phone and Address Directories, 1993-2002 | 313,273,297 |
| Pennsylvania and New Jersey, U.S., Church and Town Records, 1669-2013 | 14,243,544 |
| U.S., Quaker Meeting Records, 1681-1935 | 7,632,413 |
| U.S., School Catalogs, 1765-1935 | 5,378,762 |
| U.S., Register of Civil, Military, and Naval Service, 1863-1959 | 3,783,772 |
| U.K. and U.S. Directories, 1680-1830 | 2,518,462 |
| U.S., College Student Lists, 1763-1924 | 1,516,361 |
| U.S., Railroad Retirement Pension Index, 1934-1987 | 1,514,828 |
| U.S., Appointments of U. S. Postmasters, 1832-1971 | 1,514,110 |
| U.S., High School Student Lists, 1821-1923 | 645,940 |
| U.S., Selected Quaker College Yearbooks and Alumni Directories, 1896-2003 | 521,947 |
| U.S., Mining Accidents, 1839-2006 | 520,498 |
| U.S., World War II Cadet Nursing Corps Card Files, 1942-1948 | 390,020 |
| U.S., Encyclopedia of American Quaker Genealogy, Vol I–VI, 1607-1943 | 356,712 |
| U.S., National Register of Scientific and Technical Personnel, 1921-1970 | 320,834 |
| U.S., Baseball Questionnaires, 1945-2005 | 154,715 |
| Directory of Deceased American Physicians, 1804-1929 | 148,655 |
| U.S., Mormon Migration Records, 1840-1932 | 143,658 |
| U.S. and Canada, Quaker Yearly Meeting Annual Reports, 1808-1930 | 116,253 |
| Membership of The Church of Jesus Christ of Latter-day Saints, 1830-1848 | 104,231 |
| U.S., Sons of Norway Membership Records 1737-1970 | 90,584 |
| U.S., Index to Quaker Obituary Notices, 1822-2012 | 79,196 |
| U.S., Carded Service Records of Hospital Attendants, Matrons and Nurses, 1861-1865 | 73,588 |
| Norfolk, Virginia Directories, 1888-1890 | 57,374 |
| U.S., Quaker Genealogies, 1893-2003 | 31,254 |
| Early Members of the Reorganized Church of Jesus Christ of Latter Day Saints | 25,973 |
| Danville, Virginia, U.S., Directories, 1888-1893 | 22,651 |
| U.S., Compiled Records from Various Societies, 1875-2010 | 22,086 |
| U.S., Published Quaker Family Histories, 1845-1920 | 17,950 |
| U.S., Professional Baseball Player Profiles, 1876-2004 | 13,622 |
| Biographical Directory of the United States Congress, 1774-2005 | 12,184 |
| York County, Virginia, Charles Parish Records, 1648-1789 | 11,152 |
| U.S., Sons of the American Revolution, 1783-1902 | 10,909 |
| Blacksmiths and Related Trades Index, 1720-1940 | 9,955 |
| U.S., American Protective League Members Record Cards and Registers of Members, 1917-1919 | 8,804 |
| Presbyterian Ministerial Directory 1898 | 8,484 |
| U.S., Baptist Missionary Records and Sailing Cards, 1814-1970 | 8,068 |
| Albemarle, Virginia Record of Families, 1744-1890 | 7,422 |
| Motion Picture Studio Directories, 1919 and 1921 | 6,707 |
| Protestant Episcopal Church Clerical Directory, 1898 | 5,054 |
| Hopewell, Virginia, Friends Memberships, 1759-1776 | 4,211 |
| U.S. and Canada, Quaker Monthly Meeting Historical Data, 1671-2010 | 2,087 |
| U.S., Identification Card Files of Prohibition Agents, 1920-1925 | 1,772 |
| U.S., American Red Cross Nurse Files, 1916-1959 | 1,491 |
| Williams' Cincinnati directory | 1,334 |
| Encyclopedia of American Quaker Genealogy. Vol. VI: (Virginia) | 1,039 |
| Handy Book of American Authors, 1907 | 930 |
| New Kent County, Virginia St. Peter's Parish Vestry Book and Register, 1684-1786 | 839 |
| Harvard alumni directory, 1919 | 803 |
| The vestry book of St. Paul's Parish, Hanover County, Virginia, 1706-1786 | 691 |
| The annals and history of Henrico Parish, Diocese of Virginia : and St. John's P.E. Church | 598 |
| Old churches, ministers and families of Virginia | 503 |
| Old Churches, Ministers and Families of Virginia. With Digested Index and Genealogical Guide, Vol. I | 490 |
| Memorials of the introduction of Methodism into the eastern states | 487 |
| An apology for African Methodism | 475 |
| A Brief History of the Lutheran Church in America | 467 |
| The New-York annual register for the year of our Lord 1834 | 446 |
| U.S., Surname Index to Quaker Records | 444 |
| History of the Lutheran Church in Virginia and East Tennessee | 408 |
| Highways and hedges, or, Fifty years of western Methodism | 396 |
| Friends of a half century : fifty memorials with portraits of members of the Society of Friends, 1840-1890 | 389 |
| The colonial church in Virginia | 373 |
| Colonial churches in the original colony of Virginia : a series of sketches | 352 |
| The first century of the First Baptist Church of Richmond, Virginia : 1780-1880. | 340 |
| A history of the German Congregational churches in the United States | 328 |
| Old Chapel and the parish in Clarke County, Virginia | 288 |
| A History of the Wedgwood Family | 272 |
| Founding and organization of the Daughters of the American Revolution and Daughters of the Revolution | 206 |
| Cyclopaedia of African Methodism | 198 |
| Family notes and reminiscences | 191 |
| The history of Truro Parish in Virginia | 181 |
| The vestry book of Kingston Parish, Mathews County, Virginia (until May 1, 1791, Gloucester County), 1679-1796 | 176 |
| Surry County Records | 160 |
| Peirce's Colonial Lists | 159 |
| Quaker Arrivals at Philadelphia 1682-1750 | 137 |
| Souvenir and directory of the St. Paul Presbyterian Church of Philadelphia | 136 |
| Register of the St. Albans Presbyterian Church : organized August 22, 1868 : Seventh Avenue and E Street, St. Albans, W. Va. | 129 |
| A Directory of the representative business and professional men of Augusta County and Staunton, Va. | 123 |
| The New York church year book for 1859-60 | 119 |
| Yearbook of The United Brethren in Christ, 1917 | 116 |
| A centennial discourse delivered to the First Congregational Church and Society in Leominster, September 24, 1843 | 114 |
| Remembering the days of old, or, The Puritans and their descendants | 97 |
| History of the Park Ridge schools, 1808 to 1938 | 96 |
| Historical sketch of the Congregational church and parish of Canton Center, Conn. | 94 |
| A brief history of the Quakers in England and Virginia and the Hargrave family | 94 |
| First annual gathering of the Clan MacLean Association of North America : held in the city of Chicago, June 12-16, 1893 | 83 |
| Celebration of the two hundred and fiftieth anniversary of the landing of Samuel Packard in this country, August 10, 1638 | 73 |
| Journal of Samuel Rose Parkinson No. 1 | 69 |
| Historical and Genealogical Account of the Family of Vance (Vans, Vaux, and De Vaux) | 46 |
| A discourse delivered in the Leacock Presbyterian Church, Lancaster County, Pa., on Thanksgiving Day, November 23, 1854 | 42 |
| The buildings and churches of the mission of Santa Barbara | 40 |
| List of baptisms by Rev. John Craig, Augusta County, Virginia, 1740-1749 | 39 |
| The Wiseman family and the old church at New Salem | 36 |
| Report of the executive board of the Friends' Association of Philadelphia and Its Vicinity, for the Relief of Colored Freedmen | 32 |
| What do Jews believe? | 26 |