Sponsor(s)/Grant Number(s)
- Koppers Company
- Lake County Forest Preserve District
- Lake Michigan Federation
- Lava Beds National Monument
- Lawrence Livermore National Laboratory
- Legacy Fellowship at the American Antiquarian Society
- Leverhulme Trust
- Levitt and Sons, Inc. (Manhasset, New York)
- Library committee for RPC
- Library of Congress, National Digital Information Infrastructure and Preservation Program (NDIIPP)
- Library of Congress NDIIPP
- Library of Congress, The National Digital Information Infrastructure and Preservation Program (NDIIPP)
- Lib-Value (http://libvalue.cci.utk.edu/)
- Lincoln Memorial Garden
- Lincoln Trails Library System
- Lisa Merrifield, Illinois Extension
- llinois Office of Undergraduate Research
- Lochmueller Group
- Louisiana Department of Highways
- Louisiana State University-Shreveport, Project Leader
- Lumber Dealears Research Council
- Lumber Dealers Research Council
- Lumbermate Company (St. Louis, Missouri)
- Lumpkin Family Foundation
- MacAruthur Foundation
- Mackinaw Valley, Allin Township, and Danvers Township Water Authorities
- Madison County Council of Governments, Anderson, IN
- Manufacturing Research Center of the University of Illinois
- MARCO
- MARCO/DARPA Gigascale Silicon Research Center
- Mariselle Melendez
- Maryland Historic Trust
- Maryland Industrial Partnerships (MIPS)
- Massachusetts Board of Library Commissioners
- Matsushita Electric Corporation
- Max Kade Foundation
- Max Zar Scholarship
- Mazda
- Mazda Motor Corporation
- MAZDA Motor Corp. Research
- McArthur Foundation
- MCB SROP
- McNair Scholars Program
- M. Donjon from SAGEM Inc.
- Mellon Foundation
- Mentor Graphics
- Metropolitan Planning Council
- Metropolitan Planning Council in Chicago
- Metropolitan Water Reclamation District of Greater Chicago
- Metropolitan Water Reclamation District of Greater Chicago and Illinois Department of Natural Resources