How can I pay my fines? Admin April 24, 2018 17:44 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. Related articles How do I find new items? How do I request something you don't have? What happens if I return a book that doesn't belong to the library? How do I see my borrowing history? Was my old history lost forever? How do I log in for the first time? Comments 0 comments Please sign in to leave a comment.