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 How long is my hold on the hold shelf? What is my library card number and PIN? Comments 0 comments Article is closed for comments.