About Michigan Humane Society The Michigan Humane Society is a charitable 501 ( c ) 3 animal welfare organization and is the largest and oldest such organization in the state, caring for more than 100, 000 animals each year. EIN/Tax ID # 38-1358206. 38-1358206.Our Mission: To end companion animal homelessness, to provide the highest quality service and compassion to the animals entrusted to our...