Names
- Morris, Montrose W., 1861-19161
- Mowbray & Uffinger1
- Murphy & Olmsted1
- National Terra Cotta Society1
- Neville & Bagge1
- New Jersey Terra Cotta Co1
- New York Architectural Terra Cotta Company1
- Nirdlinger, M1
- Northwestern Terra Cotta Company1
- O.W. Ketcham Terra Cotta Works1
- Pilcher, Lewis F1
- Platt, Charles A (Charles Adams), 1861-19331
- Post, George Browne, 1837-19131
- Potter, Wilson1
- Price, Chester B. (Chester Boyce), 1885-19621
- Proudfoot, Bird and Rawson1
- Rapp & Rapp1
- Raritan Clay Co1
- Renaissance Apartments (Brooklyn, New York, N.Y.)1
- Renwick, Aspinwall & Tucker1