Colorado
- ACF Colorado Chefs Association – Apprenticeship Program
- Colorado College Directory – Apprenticeships
- Colorado Contractors Association – Apprenticeships
- Colorado Department of Labor & Employment – Building Trades Apprenticeship Programs
- Colorado Independent Electrical Contrators Rocky Mountain (IECRM)
- Colorado Pipefitters Local 208
- Colorado Springs Electrical Joint Apprenticeship and Training Committee (CSEJATC)
- Colorado Statewide Ironworkers JATC – Joint Apprenticeship & Training
- Colorado Statewide Ironworkers: Joint Apprenticeship & Training (JATC)
- Department of Regulatory Agencies (DORA): Electrical Board – Apprentice Information
- Local Union #58 Plumbers, Pipefitters and HVAC Service Technicians
- Montain States Line – Apprenticeship
- Mountain States Line Constructors
- Swisslog – Apprenticeship in Denver, Colorado
- The Beehive – Being an Apprentice Will Help Your Career
- United Association of Plumbers & Pipefitters Local Union #145
- United Association Plumbers Local Union 3
