| Owner | Count | 1.
| Maryland School for the Deaf, Frederick, Maryland | 1 | 2.
| Maryland State House, Annapolis, Maryland | 5 | 3.
| Maryland Veterans Commission, Baltimore, Maryland | 1 | 4.
| Maryland Zoo in Baltimore, Baltimore, Maryland | 9 | 5.
| Marylhurst College, Marylhurst, Oregon | 2 | 6.
| Marylhurst College, Marylhurst, Oregon | 1 | 7.
| Marymoor Park, Redmond, Washington | 1 | 8.
| Marynook Retreat Center, Galesville, Wisconsin | 3 | 9.
| Marysville Cemetery, Marysville, Kansas | 1 | 10.
| Marysville Jr. High School, Marysville, Kansas | 1 | 11.
| Maryville University, Art Department, St. Louis, Missouri | 7 | 12.
| Maryville University, St. Louis, Missouri | 7 | 13.
| Marywood College, Art Department, Scranton, Pennsylvania | 2 | 14.
| Marywood College, Scranton, Pennsylvania | 21 | 15.
| Marywood College, Scranton, Pennsylvania | 19 | 16.
| Marzo, Edward C., | 1 | 17.
| Masao W. Satow Library, Gardena, California | 1 | 18.
| Masaryk Park, Washington, District of Columbia | 1 | 19.
| Masco Collection, | 1 | 20.
| Masco Corporation, Taylor, Michigan | 2 | 21.
| Masconomo Park, Manchester, Massachusetts | 1 | 22.
| Maskaleris, Dorothy Demetra, South Norwalk, Connecticut | 1 | 23.
| Mason, Charles H., Mrs, Salisbury, Maryland | 1 | 24.
| Mason County Commissioners Court, Mason, Texas | 1 | 25.
| Mason County Court House, Havana, Illinois | 1 | 26.
| Mason County Courthouse, Mason, Texas | 1 | 27.
| Mason County Museum, Maysville, Kentucky | 0 | 28.
| See Kentucky Gateway Museum Center, Maysville, Kentucky | 11 | 29.
| Mason, Eleanor, Raleigh, North Carolina | 2 | 30.
| Mason, Emily Banister, Mobile, Alabama | 2 | 31.
| Mason, Frank, Gilroy, California | 1 | 32.
| Mason, G. W., | 1 | 33.
| Mason, Henry L., Mrs., | 1 | 34.
| Mason, James A., Mrs, Charleston, West Virginia | 2 | 35.
| Mason, Jane Fullilove, Mrs, Shreveport, Louisiana | 1 | 36.
| Mason, John, | 1 | 37.
| Mason, Manette Prud'homme, Mrs & Louis Lelandre de F. Hyams, Jr, Shreveport, Louisiana | 1 | 38.
| Mason, Mannette Prud'homme, Mrs & Louis Lalandre Hyams, Jr., Shreveport, Louisiana | 1 | 39.
| Mason, Morris L., Mr & Mrs, Montgomery, Ohio | 1 | 40.
| Mason, Redfield, Mrs, Warrenton, Virginia | 2 | 41.
| Mason, Richard H., Mrs, Raleigh, North Carolina | 1 | 42.
| Mason, Richard Jamieson Sr, Novato, California | 1 | 43.
| Mason, Rosa Tucker, Lexington, Virginia | 1 | 44.
| Mason, Sarah, | 1 | 45.
| Mason, Steve & Lou, Kettering, Ohio | 1 | 46.
| Mason, Tim & Lynn, Pacific Grove, California | 1 | 47.
| Mason, William M., Mr & Mrs, Berkeley, California | 1 | 48.
| Mason, William V. Mrs, Croton on Hudson, New York | 2 | 49.
| Masonic Cemetery, Las Vegas, New Mexico | 1 | 50.
| Masonic Cemetery, Las Vegas, New Mexico | 1 | 51.
| Masonic Commandery, Newport, Rhode Island | 1 |
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