- 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
- United Way of Nevada County
- United Way of New Canaan
- United Way of New York City
- United Way of Noble County, Inc.
- United Way of Norman, Inc.
- United Way of North Central Arkansas
- United Way of North Central Florida
- United Way of North Central Mass, Inc.
- United Way of North Central Mississippi
- United Way of Northeast Florida
- United Way of Northeast Georgia
- United Way of Northeast Michigan