American Benefit Plan Administrators, located in El Monte, Calif., is one of the largest benefit plan administrators in the United States. The company specializes exclusively in providing administrative services for employee benefit plans. Founded in 1951, ABPA has more than 50 years experience in administering benefits for Taft-Hartley Funds, large employers, and state and local governments. Along with its headquarters in El Monte, ABPA has a network of 19 service centers throughout that United States that serve its geographically dispersed clients.