| 551 | S8072387551 | Maryland, A Middle Temperament | Robert J. Brugger, Gynthia Horsburgh Requardt |
| 552 | S16144775154 | Maryland, Births and Christenings Index, 1662-1911 | Ancestry.com |
| 553 | S16144775215 | Maryland, Wills and Probate Records, 1604-1998 | Ancestry.com |
| 554 | S8072387522 | Massachusetts Marriages, 1633-1850 | Dodd, Jordan, Liahona Research, comp |
| 555 | S8072387545 | Massachusetts Town Birth Records | New England Historic Genealogical Society |
| 556 | S16144775141 | Massachusetts, Town Vital Collections, 1620-1988 | Ancestry.com |
| 557 | S16144775329 | Massachusetts, U.S., Death Index, 1970-2003 | Ancestry.com |
| 558 | S16144775352 | Massachusetts, U.S., Marriage Index, 1901-1955 and 1966-1970 | — |
| 559 | S16144775305 | Massachusetts, U.S., Marriage Records, 1840-1915 | Ancestry.com |
| 560 | S8029589919 | MasterBell_Hardin.FTW | — |
| 561 | S8029499284 | Mat(t)hias milestones : the genealogy & biographical history of Daniel Mathias, senior (a soldier of the Revolution) of Westmoreland County, Pennsylvania & Stark County, Ohio | Seale, Dorothy Weiser |
| 562 | S8029499379 | McComb Union Cemetery, McComb, Hancock County, Ohio | — |
| 563 | S8072387518 | McWilliams Family Tree | Michael Lauren |
| 564 | S8072387448 | Meachum Family History | Ginny39FL@aol.com |
| 565 | S5351696283 | meliscentholliday.FTW | — |
| 566 | S8072068423 | meliscentholliday.FTW | — |
| 567 | S8029518527 | Merle Draper's written history | — |
| 568 | S8029499499 | Michigan Deaths, 1971-1996 | Michigan Department of Vital and Health Records |
| 569 | S16144775315 | Michigan, U.S., Death Index, 1971-1996 | Michigan Department of Vital and Health Records |
| 570 | S16144775314 | Michigan, U.S., Newspapers.com™ Stories and Events Index, 1800's-current | Ancestry.com |
| 571 | S8072073726 | Mike Craddock | — |
| 572 | S8029499147 | Mike Dean, great-grandson of Ellen Adora Stambaugh Diezman, October and December 2003 | — |
| 573 | S8072384415 | Mille Lacs County Times | — |
| 574 | S8072384372 | Millennium File | Heritage Consulting |
| 575 | S8072066240 | Miller/McClelland Genealogy | john.miller@comcast.net, OneWorldTree |
| 576 | S8072073763 | Milwaukee Jounral-Sentinel | http://www.jsonline.com |
| 577 | S8072066241 | Minneapolis Star-Tribune | — |
| 578 | S8072066167 | Minnesota Birth Index, 1935-2002 | Minnesota Department of Health |
| 579 | S8072066243 | Minnesota Cemetery Inscription Index, Select Counties | — |
| 580 | S8072066165 | Minnesota Death Index 1908-2002 | Minnesota Department of Health. |
| 581 | S8072066338 | Minnesota Divorce Index, 1970-1995 | Minnesota Department of Health |
| 582 | S16144775096 | Minnesota Land Records | United States, Bureau of Land Management |
| 583 | S8072066169 | Minnesota Marriage Collection, 1958-2001 | Minnesota Department of Health, St. Paul, Minnesota |
| 584 | S8072066249 | Minnesota Naturalization Records Index, 1854-1957 | — |
| 585 | S16144775265 | Minnesota, U.S., Birth Index, 1935-2000 | Minnesota Department of Health |
| 586 | S16144775318 | Minnesota, U.S., Births and Christenings Index, 1840-1980 | Ancestry.com |
| 587 | S16144775261 | Minnesota, U.S., Death Index, 1908-2017 | Ancestry.com |
| 588 | S16144775283 | Minnesota, U.S., Divorce Index, 1970-1995 | Ancestry.com |
| 589 | S16144775277 | Minnesota, U.S., Marriage Index, 1958-2001 | Ancestry.com |
| 590 | S16144775251 | Minnesota, U.S., Newspapers.com™ Stories and Events Index, 1800's-current | Ancestry.com |
| 591 | S16144775258 | Minnesota, U.S., Territorial and State Censuses, 1849-1905 | Ancestry.com |
| 592 | S8072073728 | Missouri DAR BRC Series 2, Vol 26, Madison County | — |
| 593 | S8072387534 | Missouri Marriage Records, 1805-2002 | Jefferson City, MO, USA: Missouri State Archives. Microfilm. |
| 594 | S8072066215 | Mongeon Family Tree | Paul Jarvis, somerset@look.ca |
| 595 | S8072387535 | Monitor-Index and Democrat of Moberly, Missouri | Historical Newspaper Collection |
| 596 | S8072384409 | Montana Death Index, 1907-2002 | Montana State Genealogical Society, Montana |
| 597 | S16144775331 | Montana, U.S., Birth Index, 1870-1986 | Ancestry.com |
| 598 | S16144775330 | Montana, U.S., Birth Records, 1897-1988 | Ancestry.com |
| 599 | S16144775235 | Montana, U.S., County Marriages, 1865-1987 | — |
| 600 | S8072387567 | Morris2 Family Tree | Donald Morris, dgmorris3@hitter.net |