Colorado Education Association
- Public sector labor union that advocates for public education and represents the interests of K-12 teachers and support staff. Includes related news, related political information, and resource center.
- http://www.coloradoea.org/

Colorado Building and Construction Trades Council, AFL-CIO
- Comprised of 31 Craft Local Unions that represent 15 national and international unions. These local unions make up the nucleus of some 30,000 skilled working men and women in the state.
- http://www.cbctc.com/

IBEW Local 12
- International Brotherhood of Electrical Workers Local 12, Pueblo, Colorado. Serving the Southeastern portion of the State of Colorado in the Steel City of Pueblo, Colorado.
- http://www.ibew12.org/

Pipefitters 208
- Pipefitters union in Denver, Colorado.
- http://www.pipe208.com/

IBEW Local Union 113
- Internation Brotherhood of Electrical Workers, Local 113, Colorado Springs, CO.
- http://www.ibew113.com/

Colorado Federation of Public Employees (CFPE)
- Represents Colorado state and municipal public sector workers. CFPE is affiliated with the American Federation of Teachers through the Federation of Public Employees.
- http://www.cfpe.org/

Denver Musicians Association Local 20-623
- Union page includes professional music sites of groups, services, products and resources from the Rocky Mountain Region in Colorado.
- http://www.dmamusic.org/

Colorado AFL-CIO
- Council of unions in Colorado.
- http://www.coaflcio.org