Names
- McIntosh, Lachlan, 1725-1806.1
- Mediterranean Allied Tactical Air Force.1
- Meigs, Josiah, 1757-1822.1
- Meigs, Montgomery, 1847-1931.1
- Melville, Robert, 1723-1809.1
- Meunier, Paul A.1
- Mill, Sophia.1
- Miln, Alexander.1
- Mitchill, Samuel Latham, 1764-1831.1
- Moore, Henry, Sir, 1713-1769.1
- Mount Washington Cog Railway.1
- Muscovy Company.1
- New York Elevated Railway Company.1
- Newcastle, Henry Fiennes Pelham-Clinton, Duke of, 1720-1794.1
- Northern Pacific Railway Company.1
- Northumberland, Hugh Percy, Duke of, 1742-1817.1
- O'Hara, Charles, ca. 1740-1802.1
- O'Reilly, Alejandro, 1725-1794.1
- Ohio Company (1747-1779)1
- Oklahoma Land and Colonization Co.1