| U.S., City Directories, 1822-1995 | 1,385,585,010 |
| U.S., School Yearbooks, 1900-2016 | 881,226,611 |
| U.S., Public Records Index, 1950-1993, Volume 1 | 418,676,052 |
| U.S., Public Records Index, 1950-1993, Volume 2 | 402,455,526 |
| U.S., Index to Public Records, 1994-2019 | 330,831,843 |
| U.S., Phone and Address Directories, 1993-2002 | 313,273,297 |
| U.S., School Catalogs, 1765-1935 | 5,378,762 |
| U.S., Register of Civil, Military, and Naval Service, 1863-1959 | 3,783,772 |
| 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., Chicago and North Western Railroad Employment Records, 1935-1970 | 1,095,637 |
| U.S., Hinshaw Index to Selected Quaker Records, 1680-1940 | 887,019 |
| 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 |
| Wisconsin, U.S., Employment Records, 1903-1988 | 476,833 |
| U.S., Selected States Dutch Reformed Church Membership Records, 1701-1995 | 465,389 |
| 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., Dutch Christian Reformed Church Membership Records, 1856-1970 | 210,143 |
| U.S., Baseball Questionnaires, 1945-2005 | 154,715 |
| Directory of Deceased American Physicians, 1804-1929 | 148,655 |
| Milwaukee, Wisconsin Directory, 1889-1890 | 147,772 |
| 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 |
| U.S., Dutch Christian Reformed Church Vital Records, 1856-1970 | 52,945 |
| Appleton, Wisconsin, U.S., Directories, 1884-1898 | 40,348 |
| U.S., Quaker Genealogies, 1893-2003 | 31,254 |
| Eau Claire, Wisconsin, U.S., City Directories, 1889-1893 | 26,380 |
| Janesville, Rock County, Wisconsin, U.S., Directory, 1931 | 26,237 |
| Early Members of the Reorganized Church of Jesus Christ of Latter Day Saints | 25,973 |
| Ashland, Wisconsin, U.S., Directories, 1888-1893 | 24,124 |
| U.S., Compiled Records from Various Societies, 1875-2010 | 22,086 |
| Racine, Wisconsin, U.S., Directories, 1890, 1892 | 21,231 |
| U.S., Published Quaker Family Histories, 1845-1920 | 17,950 |
| Waukesha, Wisconsin, U.S., Directories, 1890-1892 | 17,795 |
| U.S., Professional Baseball Player Profiles, 1876-2004 | 13,622 |
| Biographical Directory of the United States Congress, 1774-2005 | 12,184 |
| U.S., Sons of the American Revolution, 1783-1902 | 10,909 |
| Blacksmiths and Related Trades Index, 1720-1940 | 9,916 |
| 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 |
| Motion Picture Studio Directories, 1919 and 1921 | 6,707 |
| Protestant Episcopal Church Clerical Directory, 1898 | 5,054 |
| 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 |
| The Catholic Church in Wisconsin | 1,161 |
| Handy Book of American Authors, 1907 | 930 |
| Harvard alumni directory, 1919 | 803 |
| University of Wisconsin, Directory 1888-1889 | 717 |
| 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 |
| Lights and shades of missionary life | 422 |
| A history of the Baptists in the western states east of the Mississippi | 421 |
| 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 |
| A history of the German Congregational churches in the United States | 328 |
| A History of the Wedgwood Family | 272 |
| History of the Presbyterian and Congregational churches and ministers in Wisconsin | 209 |
| 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 |
| Semi-centennial services of the First Congregational Church of Wauwatosa, Wis. : with sketches of early members : 1842-1892. | 190 |
| 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 |
| 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 |
| The seventy-fifth anniversary celebration of the Borough of Ridley Park, Pennsylvania, October 8 to 13, 1962 | 99 |
| 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 |
| First annual gathering of the Clan MacLean Association of North America : held in the city of Chicago, June 12-16, 1893 | 83 |
| The saga of Old Muskego | 81 |
| 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 |
| The buildings and churches of the mission of Santa Barbara | 40 |
| 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 |
| A century discourse | 26 |
| Commemorative discourse on the seventy-fifth anniversary of the reorganization of the Second Church, Exeter, N.H. | 26 |
| Ecclesiastical record | 23 |
| Clan Macleod Society, Annual Report, 1910-1911 | 19 |
| Fourth annual reunion of the Aikman family | 18 |
| The states of the Old Northwest as a missionary field | 16 |
| Bowdoin College bulletin. | 15 |