- Mayer, J. R. (John R.)1
- Merriam, W. N1
- Messinger, John 1771-18461
- Milwaukee County Land Information Office (MCLIO)1
- Milwaukee County Parks1
- Milwaukee Lith. & Engr. Co.1
- Milwaukee Metropolitan Sewerage District1
- Mitchell, S. Augustus (Samuel Augustus), 1792-1868.1
- Nicholson, W. L.1
- Nicollet, J. N. (Joseph Nicolas), 1786-18431
- Owen, David Dale, 1807-18601
- Ozersky, Ted1
- Peck, John Mason, 1789-18581
- Phelps, Humphrey,active 19th century,publisher.1
- Poole Brothers1
- Portage County Planning and Zoning Department1
- Rawdon, Clark & Co.1
- Reich, Peter B.1
- Rounds, Christopher I1
- Sewall, J. S. (Joseph S.)1