The Arc of York County officially opened its doors on October 14, 1952, becoming the 137th chapter of The Arc of the United States. Since that day, The Arc of York County has been representing the rights and interests of all people with intellectual disabilities, regardless of their age, functional levels, behavioral levels, or geographic location within York County.
- Incorporated as "Association for Retarded Children"
- Opens first day care center at St. Mark's Lutheran Church which then moves to 929 W Market St.
- Formation of Adult Recreation Club and Day Camp
- Camp Pennwood formally opens
- The Arc of York County moves programs to the JFK Memorial Training Center in York
- The new game "Tether Ball" is introduced to camp, screen doors and cement pads are installed
- Overnight cabin built at Camp Pennwood to expand camp program
- Camp Pennwood roof collapses causing $25,000 worth of damage. Within one year the building was fixed through donations of time and money.
- First "Bike and Hike" fundraising event
- Name changes to "Association for Retarded Citizens" and advocacy program begins
- The Arts and Crafts building is added as a new facility at camp and the following year carpet is installed in the lodge
- Client and Family Services Program is formalized and along with Camp Pennwood, services to clients are increased
- After-School program established as first latch-key program in PA for teens with intellectual disabilities
- "Penn Employment Services" is established to place, train, and support adults with disabilities
- The ARC changes its name to "The Arc of York County"
- The After School program moves to the YMCA of York
- The Arc Foundation is established
- The Arc opens the "Rainbow's Arc Child Care Center" at the Haymeadow building in York
- The Arc sells the "Rainbow's Arc Child Care Center"
- The Arc moves to its new home on 497 Hill Street in York
- The Arc's "After School" program moves to the Otterbein United Methodist Church in York
- The Arc's first "10 Miler Race" fundraising event
- The Arc of York County takes on the new national logo
- The Arc's "After School" program moves to Luther Memorial Church in York