- United Way of Logan County, Illinois
- United Way of Long Island
- United Way of Lowndes County
- United Way of Madison County
- United Way of Madison County
- United Way of Mahaska County
- United Way of Marathon County
- United Way of Marion County
- United Way of Marion County
- United Way of Marquette County
- United Way of Marshall County
- United Way of Marshall County
- United Way of Martin County
- United Way of Massachusetts Bay and Merrimack Valley
- United Way of Mat-Su
- United Way of Maury County
- United Way of McMinn and Meigs Counties
- United Way of McPherson, Inc.
- United Way of Medina County
- United Way of Merced County
- United Way of Mercer County
- United Way of Merrimack County
- United Way of Mesa County
- United Way of Metro Chicago
- United Way of Metropolitan Dallas
- United Way of Metropolitan Tarrant County
- United Way of Miami County, Inc.
- United Way of Miami County, Ohio
- United Way of Miami-Dade
- United Way of Mid and South Jefferson County
- United Way of Mid-Maine
- United Way of Midland
- United Way of Midland County
- United Way of Mifflin-Juniata
- United Way of Milford
- United Way of Missoula County
- United Way of Mon Valley
- United Way of Monmouth and Ocean Counties, Inc.
- United Way of Monongalia and Preston Counties
- United Way of Monroe-Lenawee Counties, Inc.
- United Way of Montcalm-Ionia Counties
- United Way of Montgomery County, Inc.
- United Way of Moore County
- United Way of Moore County, Inc.
- United Way of Morgan County
- United Way of Morrow County, Inc.
- United Way of Muscatine
- United Way of Muskingum, Perry, and Morgan Counties
- United Way of Natrona County, Inc.
- United Way of Navarro County