M320 1813*1856*MADDOX\Parkersburg, Wood County, Virginia/Jackson, Ohio
M625 1797*1875*MARKHAM\Scotland/Emmett, St. Clair, Michigan
M620 1669*1770*MARSH\Braintree, MA/Sadsbury Township, Chester County, PA
M624 1153*1895*MARSHALL\Caversham/Point Isabel, Grant County, Indiana
M635 1808*1889*MARTIN\Unknown/Newton County, Indiana
M250 1600*1852*MASON\Bolton, Lancashire, England/Unknown
M236 1462:1490:MASTERS\Wye, Kent, England/Sandwich, Kent, England
M320 1816:1854:MATHEWS\Unknown/Louisa County, Iowa
M325 1712:1719:MATHEWSON\Unknown/Providence, Providence County, RI
M230 1769*1845*McADA\Tennessee/Livingston, Polk, Texas
M213 1909:1943:McCAFFETY\Winters, Runnels County, TX/Coleman, Coleman, TX
M243 1764*1771*McCLOUD\Pomfret, Windham, CT/Pomfret, Windham, CT
M254 1766:1845:McCONNELL\Jessamine County, Kentucky/Unknown
M251 1884*1913*McCONVILLE\Tacoma, Pierce County, WA/San Francisco, CA
M265 1830*1915*McCORMICK\Ireland/Unknown
M200 1808:1859:McCOY\Adams County, Ohio/Ohio
M242 1770*1840*McCULLOUGH\Ireland/Coshocton, Ohio
M235 1818:1844:McDANIEL\Fleming County, Kentucky/Indiana
M235 1800:1858:McDONALD\Unknown/McLeansboro, Illinois
M243 1826:1828:McELDOWNEY\Lewis, Kentutcky/Kentucky
M252 1791*1893*McKENZIE\Cloggin Muie, Scotland/Kansas
M252 1844.1844.McKINSEY\Old Machar, Aberdeen, Scotland/Old Machar, Aberdeen, Scotland
M252 1876.1876.McKINZIE\Roseville, Warren, IL/Roseville, Warren, IL
M300 1837:1868:MEAD\New Hampshire/Unknown
M200 1808:1866:MEEK\Jefferson County, Ohio/Unknown
M630 1876:1899:MERRIT\Kansas or Missouri/Kansas
M650 1885:2003:MERRYMAN\Texas/Shamrock, Wheeler County, Texas
M410 1786:1792:MILBY\North Carolina/North Carolina
M420 1622*1709*MILES\Llanfinangel, Helygen, Radnorshire, Wales/Bristol Twp, Philadelphia, PA
M460 1608*1924*MILLER\Brodenbrough, Yorkshire, England/Unknown
M420 1664:1818:MILLS\Unknown/Kentucky
M560 1676*1904*MINER\Unknown/DuBois, Pawnee, Nebraska
M524 1700:1730:MINSHALL\Unknown/Chester County, Pennsylvania
M350 1487*1538*MITTON\Shrewsbury, Shropshire, England/Shrewsbury, Shropshire, England
M531 1405*1861*MONTFORT\Stoke Gifford, Gloucestershire, England/Unknown
M532 1632:1852:MONTGOMERY\Massachusetts/Scotland
M600 1600*1927*MOORE\, Glasgow, Scotland/Glen Elder, Mitchell, Kansas
M620 1761*1881*MORRIS\Mamakatin, Sullivan County, New York/Unknown
M620 1910:1949:MORSE\Downs, Kansas/Unknown
M300 1596*1678*MOTT\Saffron Walden, Essex, England/Portsmouth, Newport County, RI
M435 1485:1875:MOULTON\Ormsby, Norfolk, England/Kansas
M160 1310:1444:MOWBRAY\Hovingham, North Yorkshire, England/England
M600 1550*1825*MOWRY\Unknown/Foster, Providence, Rhode Island
M450 1834*1858*MULLEN\Delaware, Ohio/Delaware, Ohio
M516 1625*1668*MUMFORD\England/Kingstown, Washington County, Rhode Island
M610 1809:1894:MURPHY\Sandy Springs, Adams County, Ohio/New York
M236 1759*1833*MUSTARD\Sussex, Delaware/Unknown