United Against Puppy Mills was founded and organized on March 31, 2005 by residents of Lancaster County, Pennsylvania. There are no paid employees and work continues solely through the effort of volunteers. UAPM is an incorporated, federally approved 501(c)3 non-profit organization.

The primary charitable mission of United Against Puppy Mills is to promote awareness and provide training and support for people interested in effecting positive action for the elimination of puppy mills as they currently exist.