The Williamson County Council for Retarded Children, Inc. received its Tennessee State Charter of Incorporation on March 2, 1957. The non-profit organization had been initially organized on November 3, 1956 at a meeting sponsored by the Williamson County Jaycees. The purpose of the Council was to promote the education and welfare of all mentally retarded persons in Williamson County.

The Council applied for and received membership in the Tennessee Association for Retarded Children on August 26, 1958, which also involved membership in the National Association.

By 1965, the Council was instrumental in helping to establish six Special Education Classes and a Volunteer State Vocational Center, which was a training center for adults with mental retardation and/or physical disabilities. The year of 1965 also brought a name change to the organization, being known as The Williamson County Association for Retarded Children and Adults, and later changed to the Williamson County Association for Retarded Citizens.

In 1970, the Association saw the need for a summer camp for children with special needs. This camp became known as Camp Will and continued until 1997 as a free-standing organization.

The Tennessee Arc voted the Williamson County Association for Retarded Citizens outstanding local Association in the years 1976, 1979, and 1982.

In 1992, The Association underwent another name change initiated on the national level and was then known as The Arc of Williamson County.

Beginning in the fiscal year 1995, The Arc of Williamson County began a cooperative relationship with The Arc of Davidson County in administering the state Family Support Program. In 1997, The Arc of Williamson County received a contract from the state to administer the Family Support Program directly. In addition, in 1997, The Arc of Williamson County was awarded a contract from the state to provide Independent Support Services and Coordination to individuals in the Medicaid Waiver Program.

In July of 2000, Williamson County Partners in Education was formed working as part of the Education Committee of The Arc of Williamson County. WC-PIE is a group of parents, educators, administrators, and community members who have joined together in an effort to maximize the educational opportunities for all students in Williamson County. The group abides by the underlying philosophy that inclusive education is the way to educate all students. In July of 2001, The Arc of Williamson County added the Student Advocacy Program, working with school age individuals eligible for special education services and their families in order to help them navigate the IEP process.

On July 1, 2010, The Arc expanded its name to the disAbility Resource Center of Williamson County and on July 1, 2011 joined the national The Arc movement and became The Arc Williamson County-a disability resource center for people with intellectual and developmental disabilities.  The Arc is an organization committed to promoting and empowering individuals with disabilities and their families through advocacy, research, education and quality of life services.  Supporting all individuals in securing the right to choose and realize their goals of where and how they live, learn, work and play is the major focus of The Arc.  The Arc today has maintained the original belief and commitment that was established in 1956 at that first organizational meeting.