Arch Street CenterThis entry was posted in Lancaster County Directory Arch Street Center Arch Street Center 629 North Market Street Lancaster, PA 17603 Lancaster County http://www.archstreetcenter.org Phone (717) 392-8536 Hours of Operation Mon - Fri. 9 - 5:30; Sat - Sun. 11 - 5 Services We provide structured activities, nutritious meals, basic needs services, essential services such as showers, laundry, and hygiene products. We focus on social rehabilitation for adults living with serious mental illness. Community Service Group (CSG) Community Service Group (CSG) 1902 Olde Homestead Lane Lancaster, PA 17603 Lancaster County https://csgonline.org Phone (717) 794-6481 Hours of Operation Monday - Friday 8:30 - 3 Services A variety of changing social and educational groups are offered each day as well as activities in the community.