How can I pay my fines? Admin April 15, 2019 18:02 Updated Follow You may pay your fines online, at any library self-check kiosk, or by mailing a check to Douglas County Libraries at 100 S. Wilcox Street, Castle Rock, CO 80104. Learn more about Fines, Fees and Borrowing. Related articles I lost my library card. What should I do? Comments 0 comments Article is closed for comments.