| | Database Title | Category | | Names |
|---|
 | UK Marriage List, 1655-1992 | Birth, Marriage and Death Records | | 58,816 |
 | UK Parish Baptisms | Birth, Marriage and Death Records | | 6,110 |
 | UK Parish Burials | Birth, Marriage and Death Records | | 5,434 |
 | UK Parish Marriages | Birth, Marriage and Death Records | | 13,122 |
 | Ukiah City Press (Ukiah,California) | Newspapers and Periodicals | | 652 |
 | Ukiah Dispatch Democrat (Ukiah,California) | Newspapers and Periodicals | | 93,828 |
 | Ulster County, New York Probate Records, From 1665 (Free until 30 Nov 2009) | Court, Land, and Probate Records | | 19,195 |
 | Ulysses S. Grant | Birth, Marriage and Death Records | | 12,892 |
 | Uncertain Justice: Canadian Women and Capital Punishment, 1754 - 1953 | Court, Land, and Probate Records | | 8,717 |
 | Uncle John Vassar | Miscellaneous Records and Reference | | 1,222 |
 | Under Arrest: Canadian Laws you Wont's Believe | Birth, Marriage and Death Records | | 68 |
 | Under the Black Horse Flag: Annals of the Weld Family and Some of its Branches | Social, Regional and General History | | 18,629 |
 | Underhill Genealogy | Social, Regional and General History | | 87,479 |
 | Unedited Letters of Jonathan Jennings | Social, Regional and General History | | 4,097 |
 | Ungerfehr, Uncapher, Unkefer, Genealogica et Biographica | Social, Regional and General History | | 24,356 |
 | Union and Confederate Soldiers and Sympathizers of Barbour County, West Virginia | Military Subjects | | 11,992 |
 | Union Dispatch (Tipton,Indiana) | Newspapers and Periodicals | | 465 |
 | Union Star (Union,Iowa) | Newspapers and Periodicals | | 64,741 |
 | United King Book, 1820 - 1960 | Birth, Marriage and Death Records | | 8,224 |
 | United States Air Force Academy Colorado Springs - Polaris Yearbook | Directories and Lists | | 4,772 |
 | United States Coast Guard Academy - Tide Rips Yearbook | Directories and Lists | | 30,575 |
 | United States Merchant Marine Academy Kings Point - Midships Yearbook | Directories and Lists | | 40,547 |
 | United States Military Academy West Point - Howitzer Yearbook | Directories and Lists | | 185,798 |
 | Universal Spectator and Weekly Journal (London,United Kingdom) | Newspapers and Periodicals | | 8,848 |
 | University of Arizona - Desert Yearbook | Directories and Lists | | 17,106 |
 | University of California - Berkeley Blue and Gold Yearbook | Directories and Lists | | 727,430 |
 | University of California Los Angeles - UCLA Bruin Life Yearbook | Directories and Lists | | 9,876 |
 | University of Florida - Tower Yearbook | Directories and Lists | | 30,048 |
 | University of Iowa - Hawkeye Yearbook | Directories and Lists | | 92,895 |
 | University of Kansas - Jayhawker Yearbook | Directories and Lists | | 290,301 |
 | University of Miami - Ibis Yearbook | Directories and Lists | | 20,510 |
 | University of Michigan - Michiganensian Yearbook | Directories and Lists | | 679,822 |
 | University of Minnesota - Gopher Yearbook | Directories and Lists | | 231,916 |
 | University of Mississippi - Ole Miss Yearbook | Directories and Lists | | 7,505 |
 | University of Notre Dame - Dome Yearbook | Directories and Lists | | 142,957 |
 | University of Southern California - El Rodeo Yearbook | Directories and Lists | | 349,383 |
 | University of Texas - Cactus Yearbook | Directories and Lists | | 935,913 |
 | University of Toronto, Roll of Service, 1914 - 1918 | Military Subjects | | 70,572 |
 | Unofficial Letters of an Official's Wife (Edith Moses) | Miscellaneous Records and Reference | | 548 |
 | Unpublished Geraldine Documents: The Earls of Desmond | Social, Regional and General History | | 13,005 |
 | Up From Slavery: An Autobiography (Booker T. Washington) | Miscellaneous Records and Reference | | 1,679 |
 | Up Stream: An American Chronicle (Ludwig Lewisohn) | Miscellaneous Records and Reference | | 937 |
 | Upham and Amherst, New Hampshire Memories: The Genealogy and History of a Branch of the Upham Family | Social, Regional and General History | | 4,550 |
 | Upham Genealogy. the Descendants of John Upham of Massachusetts, Who Came From England in 1635, and Lived in Weymouth and Malden | Social, Regional and General History | | 21,498 |
 | Upham Genealogy: The Descendants of John Upham, of Massachusetts, Who Came from England in 1635, and Lived in Weymouth and Malden | Social, Regional and General History | | 42,246 |
 | Upper Des Moines Republican (Algona,Iowa) | Newspapers and Periodicals | | 20,191 |
 | Upper Des Moines, The (Algona,Iowa) | Newspapers and Periodicals | | 658 |
 | US Korean Casualties 1950 - 1957 | Military Subjects | | 33,642 |
 | Utah 1930 US Census Index | Census and Voter Lists | | 403,077 |
 | Utah and Idaho Cemetery Records, Volume 1 | Court, Land, and Probate Records | | 34,877 |
 | Utah Genealogical and Historical Magazine, Volume 1 | Miscellaneous Records and Reference | | 3,946 |
 | Utah Genealogical and Historical Magazine, Volumes 3-4 | Miscellaneous Records and Reference | | 4,392 |
 | Utah Genealogical and Historical Magazine, Volumes 5-6 | Miscellaneous Records and Reference | | 3,432 |
 | Utah Gravestone Photo Project | Directories and Lists | | 33,189 |