Koinonia is the largest private provider of services for people with intellectual and/or developmental disabilities throughout Cuyahoga County and employs a staff of over 500 people. Long-term care services are provided to individuals living in 21 group homes (24/7 care); 50 supported living sites; and 3 Host Homes. In addition to residential services, The Center at Koinonia serves day support, vocational and career needs. Total enrollment in both Koinonia's residential, day, vocational and career programs is 424 participants.

When Koinonia Homes, Inc. first opened its doors in 1974 to eight women at Leans House, supporters believed that with guidance and assistance, individuals with IDD could participate in everyday community life and be contributing citizens in a meaningful way. Since then, Koinonia has grown exponentially increasing the types of services provided and the number of people served. In 2006, Koinonia opened its Adult Day Support and Vocational and Career Center known as Koinonia Enterprises, where day programming needs are met and employment skills are taught.