- Maack, John Henry Carl - Treynor
- Maas, Henry Peter - Macedonia
- Maassen, Julius Gustav - Walnut
- Mabbitt, Everett L. - Treynor
- Mace, Fred LeRoy - Loveland
- Machan, Charles Henry - Loveland
- Madsen, John - Avoca
- Madsen, Peter Jorgen - Avoca
- Magnssen, Earl Emil - Neola
- Maguire, Leo LeRoy - Carson
- Mahood, Robert Roy - Weston
- Mahood, Russel Wayne - Weston
- Malskeit, Edward Herman - Silver City
- Malskeit, Wililam - Silver City
- Maltsberger, John Nelson - Oakland
- Maltsberger, Walter Herman - Carson
- Mammen, Fred Edward - McClelland
- Mammen, Henry F. H. - McClelland
- Manhart, Alfred Paul - Minden
- Manhart, Joseph Martin - Minden
- Manty, Adolph Fred - Neola
- Marchses, Sebastiano - Crescent
- Mark, Elmer Gatfra - Neola
- Mark, Peter, Jr. - Avoca
- Mark, Lawrence - Neola
- Marquardt, Harry H. - Avoca
- Marquardt, Willie Albert - Avoca
- Marsh, Cyril LeRoy - Silver City
- Marsh, Winston Jack - Oakland
- Martens, Claus Henry - Minden
- Martens, Fred - Minden
- Martens, Robert - Minden
- Martin, Jacob Casper - Lewis
- Martin, Mervin Warner - Hancock
- Marxen, John Henry - Lewis
- Marxen, Otto Herman - Lewis
- Marxen, William Fred - Wright Twp.
- Masengill, Peter Columbus - Bentley
- Mass, Arthur P. Herman - McClelland
- Mass, Carl Ferdinand - Silver City
- Mass, George Hans - Silver City
- Massey, Lewis Preston - Neola
- Masters, George Forrest - Underwood
- Matheson, Clarence - Co. Bluffs
- Matheson, Eugene K. - Weston
- Matheson, Perry - Weston
- Mathiasan, Anton William - Co. Bluffs
- Matson, Junie Earl - Neola
- Mathews, Clarence Howard - Oakland
- Mathews, Leland Walter - Oakland
- Mathews, Orrin Lewis - Carson
- Mathies, John Henry - Walnut
- Matthiesen, Carl Marias - Underwood
- Mauer, Arthur H. - Minden
- Mauritz, Joseph D. - Clarinda Asylum
- May, Alonzo Martin - Co. Bluffs,
- McAlexander, Lee - Dumfries
- McBride, Dudley Monroe - Oakland
- McBride, Francis Peter - Missouri Valley
- McCaffrey, Peter C. - Griswold
- McCallan, Lee Andrew - Co. Bluffs
- McCallan, Seth J. - Co. Bluffs
- McCart, Ralph - Avoca
- McCarthy, Daniel Florence - Avoca
- McCarthy, Daniel Francis - Neola
- McCarthy, Satolli Joseph - Neola
- McCartney, Marian Francis - Co. Bluffs
- McCarty, Raymond Michael - Walnut
- McCaskey, Harry Warren - Elliott
- McCaskey, Paul Cline - Elliott
- McClelen, Max - Crescent
- McClung, Judson Lewis - Carson
- McClure, Albert Lynn - Griswold
- McClure, Orrin Lester - Co. Bluffs
- McClure, William Francis - Co. Bluffs
- McClurg, Lynn H. - Underwood
- McCluskey, Harrison J. - Elliott
- McCluskey, Leo Frederick - Griswold
- McConnell, Claude - Wright Twp.
- McConnell, John G. - Oakland
- McConnell, John Henry - Griswold
- McCoun, Charley Nathan - Hamburg
- McCoun, Claude Frank - Hamburg
- McCready, Ralph - Macedonia
- McDaniel, George Roy - Co. Bluffs
- McDermott, Tom - Walnut
- McDonald, James Andrew - Neola
- McDonald, Patrick John - Minden
- McDonald, William Joseph - Neola
- McDowell, Francis Leon - Avoca
- McFarland, George Earl - Co. Bluffs
- McGrath, Stuart - Neola
- McIntosh, Asa Elmer - Loveland
- McIntosh, Collie - Crescent
- McIntosh, Melvin H. - Honey Creek
- McIntosh, Ore Oscar - Honey Creek
- McIntosh, Riley - Honey Creek
- McIntosh, William - Honey Creek
- McKay, Ora Orson - Walnut
- McKenzie, Lee - Carson
- McKeown, George Daniel - Neola
- McKeown, Raymond A. - Honey Creek
- McKern, Charles - Co. Bluffs
- McKinley, Stewart E. - Avoca
- McKinney, Chester - Silver City
- McKinney, Lawrence Glen - Hancock
- McKinney, Richard Burl - Hancock
- McKnight, Glen Elwood - Oakland
- McKray, Melvin Boyd - Hancock
- McLaughlin, Edward - Hancock
- McLean, Floyd W. - Neola
- McMahon, Thomas Isador - Walnut
- McMullen, Harley - Crescent
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- McMullen, Harry W. - Weston
- McMullen, LeRoy Earl - McClelland
- McNamara, John Joseph - Carson
- McNay, Glen Wendell - Silver City
- McQuaid, Roy Hamilton - Co. Bluffs
- McReynolds, Clyde - Oakland
- McReynolds, Rolla - Oakland
- McVey, Carl - Griswold
- McVey, William Elzy - Griswold
- Meadows, Floyd Alva - Minden
- Meadows, Kellys - Minden
- Mecklenburg, Hermand W. - Avoca
- Meier, Carl Rudolph - Avoca
- Meier, Otto Albert Ernest - Dumfries
- Mellott, Frank - Elliott
- Menefee, James Charles - Walnut
- Menschal, Paul Herman -Hastings
- Merkert, Gustab Ludwig H. - Minden
- Messenger, Ralph Lynn - Co. Bluffs
- Messerli, Walter Robert - Dumfries
- Messerli, Ed William - Dumfries
- Metzger, Walter E. Hancock
- Mewhirter, Ward Eldon - Griswold
- Meyer, Edward Ferdinand - Hancock
- Meyer, Fred George - Co. Bluffs
- Meyer, Ludwig, Jr. - Hancock
- Meyer, Walter - Hancock
- Michaelsen, Alfred Chris - Missouri Valley
- Michaelsen, Hans Peter - Missouri Valley
- Mickel, George Arthur - Walnut
- Michey, Homer - Macedonia
- Mikesell, Roy - Carson
- Mikkelsen, Jens - Carson
- Miler, Ervil F. - Oakland
- Miler, Roy S. - Oakland
- Millard, Alfred Roe - Co. Bluffs
- Miller, Anton Chris - Avoca
- Miller, Arthur William - Neola
- Miller, Claud - Hancock
- Miller, Clyde Richard - Macedonia
- Miller, Elmer Lewis - Oakland
- Miller, George John - Neola
- Miller, Harvey Chris - Silver City
- Miller, Herman Harry - Dumfries
- Miller, Howqard Russell - Hancock
- Miller, Jess - Co. Bluffs
- Miller, John A. - Co. Bluffs
- Miller, P. Chris Paterson - Avoca
- Miller, Peter Emil - Walnut
- Miller, Roy Alvin - Hancock
- Miller, Roy August - Silver City
- Millis, William Franklin - Avoca
- Mills, Lawrence C. - Oakland
- Mills, Will Robert - Hancock
- Mils, Gustav Herman - Co. Bluffs
- Minnick, Jesse Lawrence - Hancock
- Minks, Ernest J. - Hancock
- Minter, Owen Richard - Co. Bluffs
- Mitchell, Merle Dache - Carson
- Mize, Clyde Allen - Co. Bluffs
- Mizer, Herman - Oakland
- Moates, Emil Johanis - Co. Bluffs
- Moates, Glen Harley - Griswold
- Moates, Thomas Henry - Griswold
- Moelck, Hans - Walnut
- Moelck, William Frederick - Avoca
- Moffitt, Edward Arthur - Neola
- Moffitt, George Brock - Neola
- Moffitt, Lynn Ulysses - Neola
- Mogensen, Albert M. - Boomer Twp.
- Mohr, John H. - Walnut
- Moler, Bryce Orville - Carson
- Moline, Emmon - Co. Bluffs
- Monger, Joseph Henry - Griswold
- Montoya, Joe - Neola
- Mora, Adolph - Avoca
- Moran, Leo Daniel - Honey Creek
- Morehouse, Roy Cleo - Co. Bluffs
- Morelock, Elbert Green - Oakland
- Moore, Beecher S. - Oakland
- Moore, Charles Vivian - Neola
- Moore, Homer D. - Macedonia
- Moore, Ross William - Macedonia
- Moorehead, Harold B. - Underwood
- Moreleghem, Ren Van - Underwood
- Morris, Clyde - McClelland
- Morris, Clyde C. - Carson
- Morris, Edgar Alonzo - Co. Bluffs
- Morris, James - Oakland
- Morris, Ray - Oakland
- Morris, William Herman - Neola
- Morrison, Lennox - Crescent
- Morrison, Robert - Loveland
- Morrow, Pearl Glenn - Avoca
- Mortensen, Morten H. - Weston
- Morton, John, Jr. - Elliott
- Moss, Beauford Eugene - Loveland
- Motz, Mate - Avoca
- Mowery, Guy Eugene - Hancock
- Moxley, William Thomas - Carson
- Moyers, Albert Edison - Oakland
- Muhlestein, Otto - Oakland
- Mulcahy, Earl - Carson
- Mullins, Arthur - Neola
- Munn, Adolph John - Neola
- Munro, Roderick Duncan - Griswold
- Murray, Meredith B. - Macedonia
- Murrell, Eaphus M. - Center Twp.
- Murrell, Samuel Austin - Carson
- Myers, Charley - Avoca
- Myers, Clarence McKee - Griswold
- Myers, Orville Simpson - Walnut
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