Clark Service Group is a multifaceted service company headquartered in Lancaster, Pennsylvanian.

Clark Service Group is a multifaceted service company headquartered in Lancaster, Pennsylvanian. Clark Service's Group of factory trained technicians provide business with new construction design, installation, replacement parts and maintenance programs tailored to business individual needs. With over 40 years of experience, servicing customers in Pennsylvanian, Maryland, New Jersey, and Delaware, Clark Service Group has become a trusted name in the building services industry.