Jefferson County Public Library (JCPL) is the third largest public library in the state of Colorado. Our mission is to meet the changing needs of our communities by providing information and environments that promote personal growth and community transformation. A JCPL library card is the smartest card in your wallet, giving you access to an online library that operates 24 hours per day, seven days per week, a network of 10 libraries, a Bookmobile, a Traveling Children’s Library and an eTrain mobile computer training lab, as well as books, periodicals, CDs and DVDs, audio and eBooks, and computer and Internet resources.