The Pierce County Library System (PCLS) is a library system serving the residents of Pierce County, Washington. The Pierce County Library System has 20 library locations serving 580,000 people in unincorporated Pierce County and 15 cities and towns which have annexed to the system for library service. It circulates 6.9 million items annually, hosts seasonal youth story times, teen clubs, events for youth and adults, classes for skills development and technology, an active summer reading program, and connects with social media. In 2016, there were 334,362 library cardholders, PCLS locations had more than 2.2 million visitors, and the website had more than 3.5 million visitors.