- American Postal Workers Union
- Carpenters Apprenticeship
- Communications Workers-America
- Cumberland Firefighters Local
- IBEW
- Laborers International Union
- National Assn-Letter Carriers
- Plumbers & Steam Fitters
- Sheet Metal Workers
- Teamsters & Chauffeurs Union
- United Food & Commercial Wrkrs
- Western Maryland Bldg & Constr
- Western MD Central Labor
