| Type | Region | Begin Date | End Date | Description | Format |
|---|
| Family | | 1637 | 1840 |  The Wight family : memoir of Thomas Wight of Dedham, Mass., with genealogical notices of his descendants, from 1637 to 1840 | Online |
| Vital | MA | 1638 | 1840 | Essex, Massachusetts Probate Records, 1638-1840 | Online |
| Family | | 1652 | 1840 | Genealogical and biographical sketches of the Hildreth family : from the year 1652, down to the year 1840 | Online |
| Other | CT | 1694 | 1840 |  Cheshire, Connecticut: Town History, 1694-1840 | Online |
| History | CT | 1694 | 1840 |  History of Cheshire, Connecticut from 1694 to 1840 | Online |
| Family | PA | 1711 | 1840 |  Report on the Holtzappel family of York County, Pennsylvania, 1711-1840 | Online |
| Family | ME | 1755 | 1840 | The ancestry of Sarah Miller, 1755-1840 : wife of Lieut. Amos Towne of Arundel (Kennebunkport) Maine | Online |
| Other | | 1770 | 1840 | The life of John Thornton Kirkland, a president of Harvard, 1770-1840 | Online |
| Church | PA | 1774 | 1840 | Northampton County, Pennsylvania Church Records, 1774-1840 | Online |
| Other | | 1784 | 1840 | The pioneers of Unadilla village : 1784-1840 | Online |
| World | | 1788 | 1840 | Steinfeld, Germany Baptisms, 1788-1840 | Online |
| Census | | 1790 | 1840 | Smocks in the censuses, 1790-1840 | Online |
| History | NC | 1790 | 1840 | North Carolina schools and academies, 1790-1840 : a documentary history | Online |
| Other | | 1796 | 1840 | Pioneer life in Dayton and vicinity, 1796-1840 | Online |
| Family | | 1796 | 1840 | The pioneer families of Cleveland, 1796-1840 | Online |
| Other | | 1815 | 1840 | Men and money : the urban frontier at Green Bay, 1815-1840 | Online |
| History | | 1816 | 1840 | The history of early Terre Haute : from 1816 to 1840 | Online |
| Vital | MO | 1820 | 1840 | Pike County, Missouri Marriages: 1820-1840 | Online |
| Other | | 1830 | 1840 | Home history : recollections of Buffalo during the decade from 1830 to 1840, or fifty years since | Online |
| Directory | | 1839 | 1840 | Shaffer's advertising directory for 1839-40 | Online |
| Directory | NY | 1839 | 1840 | Manhattan, New York City, New York Directory: 1839-1840 | Online |
| Census | | 1840 | | 1840 United States Federal Census | Online |
| History | | 1840 | | A historical discourse delivered by request before the citizens of Farmington, November 4, 1840 : in commemoration of the origi | Online |
| Other | | 1840 | | Early Chicago : reception to the settlers of Chicago prior to 1840, by the Calumet Club, of Chicago, Tuesday evening, May 27, 1 | Online |
| Immigration | | 1840 | | Eliza and James Gregson, Life in California, 1840s | Online |
| Vital | | 1840 | | Guidelines for analyzing the Map of 1840 property holdings along English neighborhood road within Leonia | Online |
| Other | | 1840 | | Heinrich Lienhard, Life at Sutter's Fort, 1840s | Online |
| Other | | 1840 | | John R. St. John, Lake Superior Country, 1840s | Online |
| Directory | | 1840 | |  Kent 1840 Pigot's Directory (on CD) | CD |
| History | | 1840 | | Semicentennial sermon, containing a history of Middlebury, Vt., delivered, Dec. 3, 1840 : being the first Thanksgiving Day, aft | Online |
| Directory | | 1840 | |  Sussex 1840 Pigot's Directory (on CD) | CD |
| Directory | | 1840 | 1841 |  1840/1 Bentley's Directory - Worcestershire (on CD) | CD |
| Military | | 1840 | 1847 | LDS Military Records, 1840-1847 | Online |
| Other | | 1840 | 1853 | Governors' letter-books, 1840-1853 | Online |
| Other | | 1840 | 1890 | Friends of a half century : fifty memorials with portraits of members of the Society of Friends, 1840-1890 | Online |
| History | | 1840 | 1896 | History of the Worcester Guards and the Worcester City Guards : from 1840 to 1896 | Online |
| Other | | 1840 | 1925 | James Hills Moore : Chicago, 1840-1925 | Online |
| History | | 1840 | 1940 | History of Leesport and West Leesport, 1840-1940 | Online |
| Other | | 1840 | 1940 | Shining lights of Schnecksville, 1840-1940 | Online |
| Other | | 1840 | 1940 | Sketches of Harrisonburg, 1840-1940 | Online |
| Other | | 1840 | 1942 | England, Southern Railway Magazine: Jan 1840 - Feb 1942 | Online |
| Other | | 1840 | 1947 | They Sowed The Seeds: A Historic Glimpse of Cudlee Creek 1840-1947 (on CD) | CD |
| Vital | | 1840 | 1970 | New Orleans Deaths, 1840-1970 | Online |
| Other | | 1840 | 2000 | Library of Congress Photo Collection, 1840-2000 | Online |
| Census | AR, KS | 1840 | | Arkansas Census, 1840 | Online |
| Directory | IA | 1840 | 1890 | Iowa City, Iowa Semi-Centennial Directory, 1840-90 | Online |
| Census | IN | 1840 | | Index to the sixth census of the United States for Allen County, Indiana, 1840 | Online |
| Vital | KS | 1840 | 1935 | Leavenworth, Kansas Deaths, 1840-1935 | Online |
| Vital | MO | 1840 | | Missouri Marriages Before 1840 | Online |
| Other | MS, OH | 1840 | | Journal of Jos. W. Fawcett : (diary of his trip in 1840 down the Ohio and Mississippi Rivers to Gulf of Mexico and up the Atlan | Online |
| Church | RI | 1840 | 1940 | The first hundred years : Pawcatuck Seventh Day Baptist Church, Westerly, Rhode Island, 1840-1940. | Online |
