| Surnames | Time Period | Researcher |
| Madden | 1912 - ? | Laura Cies |
| Maddox | 1916 - now | Jack L. Maddox |
| Madison | 1890 | Shirley McCay |
| Mahan | 1950 - now | Verna Bice |
| Mahaney | 1850 - now | Ben Mahaney |
| Mainz | 1870 - 1920 | Marci Schrader |
| Mallicoat | 1904 - 1924 | Michael Wiles |
| Maness | 1930 - 1950 | Ed Maness |
| Mann | 1880 - 1908 | Norma Murphy |
| Manjeot | 1880 - now | Margie Grubbs |
| Martin | Veanna Carr | |
| Martin | 1860 - 1900 | Donna Martin |
| Martson | 1970 - now | Vera Martson |
| Marvin | 1890 - now | Julia (Marvin) Royston |
| Mathewson | 1860 - 1900 | H. Maffucci |
| Maus | 1884 - 1900 | Molly Gardner |
| Maxwell | 1895 - 1920 | Deb Shillo |
| Mayfield | 1880s - now | Howard Eugene Mayfield |
| McCarty | 1870s | Michael Wallis |
| McChesney | 1951 | Karen Munro |
| McClain | 1881 - 1960 | Jacki Nicodemus |
| McCollough | 1880 - 1920 | Barbara Watkins |
| McCollum | 1860 - now | Cheryl McCollum Schubert |
| McConnell | 1920 - 1924 | Bev Catalano |
| McConnell | 1880 - 1940 | Cheryl Behrend |
| McCully | c1920 - 1960 | Edward Miller |
| McDonald | . | Susie Chabak |
| McDowell | 1940s | Anne Ochs/Anthony McDowell |
| McDowell | 1939 - 1960 | Louise McDowell Payne |
| McFadden | 1901 | Ruth McFadden Sherrick |
| McFrancis | c1876 | Judy LaCorte |
| McGeachy | 1880s - 1920s | Marcia Streetman |
| McGinn | 1860 - now | Bonnie Jones |
| McGuire | 1870 - 1950 | Deb Shillo |
| McKeen | 1870 - 1930 | Stephanie Eaton |
| McKnight | 1880 - now | Lorna Marvin |
| McLain | 1880 - 1885 | Richard H. Drew |
| McMellan | 1900 - 1940 | Diane Cullen |
| McMillin | 1930 - now | Jim DeWitt |
| McMurry | 1870 - now | Carol McMurry |
| McPherson | 1900 - 1912 | Basil Szoo |
| McRoberts | 1900 - 1940 | Mary Pollitt |
| McVay | 1850 - now | Tresa McVay |
| Mead | 1880 - now | Susan Hatfield |
| Medley | 1860 -1975 | Marjorie M. Medley |
| Merritt | . | Karleen (Penny) Street |
| Merry | 1900 - 1951 | Ray Downing |
| Metzen | . | Vicki Wright |
| Metzen | . | Larry Alexander |
| Michael | 1879 - 1949 | Mike Graham |
| Milby | 1992 | Carolyn Anderson |
| Millar | 1890 - 1970 | Ben Millar |
| Miller | 1910 - 1938 | Larry D. Flowers |
| Miller | 1930s | Naomi "Miller" Conway |
| Miller | 1880 - now | Jan Guiliano |
| Miller | 1885 - 1910 | Beverly A. Lacey |
| Miller | . | Lynette Trainer |
| Miller | 1874 - 1902 | Ron Levagood |
| Mills | 1855 - 1915 | Darlene Mills |
| Mills | Patricia Frankel | |
| Minick | 1870 - 1930 | Charles Wayne Minick |
| Minnich | 1872 - ? | Barbara Sullivan |
| Minnix | 1930 - 1962 | Bill Taylor |
| Mishler | 1930s - now | Ronda Williams |
| Montgomery | Tamma Ferra | |
| Moore | b:1863? - d:1931? | Gwen Barnes |
| Morgan | 1870 - now | Julia (Marvin) Royston |
| Mork | 1870 - now | Robert Mork |
| Morning | . | Lynn & Rita Balichek |
| Morris | 1850 - now | Michael Cook |
| Morss | 1868 - now | Joyce (Routh) Willhoit |
| Morton | 1900 - 1905 | Janis E. Freeman |
| Mos | 1968 - 1996 | Eileen Edler |
| Mourning | 1860 - now | Linda Lee Mourning |
| Mullen | 1895 - 1945 | Dick |
| Mullenneix/Mullennieux | 1900 - 1920s | Robert L. Van Buskirk |
| Muninger | c1880 | Christina Smathers |
| Murdock | 1900 - 1921 | Alice Deaton |
| Murphy | 1930s - 1950s | George V. Long |
| Murray | 1925 - 1936 | Rene Worland |
| Myers | 1856 - | Mary Klassen |
| Mylatz | . | Uwe Mylatz |
| Nance | 1870s - ? | Robert L. Nance |
| Neagle | 1870 - 1905 | Michael Stinson |
| Neelsen | . | John Neelsen |
| Neff | 1870 - now | Beverly A. Lacey |
| Newfer | 1880 - now | Kary Wild |
| Newkirk | 1920 - now | Wayne L. Newkirk Jr. |
| Nicholas | . | R. Nicholas |
| Nichols | . | Kim Duren |
| Nichols | 1910 - c1918/20? | Kenneth Nichols |
| Nicholson | 1875 - 2004 | Bernice Nicholson Thach |
| Nighswonger | 1880 - now | Glenda Nighswonger |
| Noland | Philip Gould | |
| Nordstrom | - 1972 | Charles Nordstrom |
| Norris | 1850 - 1920 | Darla C. Clark Knytych |