The Special District Association of Colorado (SDA) is a statewide membership organization created in 1975 to serve the interests of the special district form of local government in Colorado. Special districts fill a vital role in providing many of the basic services and public needs of the people of Colorado, including fire and rescue services, water and wastewater treatment and delivery, parks and recreation amenities, hospitals, libraries and cemeteries. SDA has nearly 1,300 special district members and over 150 associate members. SDA associate members include attorneys, accountants, investment advisors, engineers, management companies and other consultants. These knowledgeable professionals provide information for the operation and development of special districts in Colorado.

The Special District Association was organized to provide better communication, research, legislative input, administrative support, and educational opportunities for member districts. SDA exists to help special districts serve the public in the most efficient and economical manner possible. The Special District Association advocates on behalf of special districts before the Colorado General Assembly on behalf of all SDA members.

The Special District Association hosts an annual conference every September. The SDA Annual Conference offers several days of training and networking opportunities for SDA district board and staff members, as well as associate members.