ABBCO Service Corporation, a building service contract headquartered in St. Louis, has joined National Service Alliance (NSA), Mooresville, North Carolina.

ABBCO was founded in 1955 and has been owned by the same family since 1963. The company and its more than 700 employees provide facility maintenance and janitorial services to customers throughout the midwest and southeast United States. Those customers include commercial properties, manufacturing plants, distribution warehouses, medical and educational institutions.