Jefferson County Public Library, Public library in Jefferson County, Colorado.

Jefferson County Public Library is a public library with ten locations throughout the county offering books, digital resources, and educational programs. The collection includes physical materials, research databases, and online courses accessible through the website jeffcolibrary.org.

Founded in 1952, the Jefferson County Public Library grew out of several small municipal libraries that joined under one county system rather than starting from a single site. Its collection rose from 35,000 items to more than 1.3 million, and revenue from $10,000 to $25.6 million. On March 7, 2024, its 350 workers voted 213-62 to unionize with AFSCME, the first county workers to organize under Colorado Senate Bill 22-230.

The library runs reading programs such as '1000 Books Before Kindergarten' that help children discover books from an early age. These initiatives encourage families to make reading a regular part of daily life.

The libraries are open to the public and a library card provides access to all physical and digital collections. It helps to check the website jeffcolibrary.org to locate branches and learn which resources are available.

The library system operates a Bookmobile service that brings books and educational materials directly to neighborhoods and communities. This service reaches people who cannot easily travel to a branch location.