The Castleton Public Library is located on the first floor of the Castleton Village Hall, which is located at the corner of South Main Street (Route 9J) and Stimpson Avenue in Castleton.

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Castleton Public Library, 85 South Main Street, Castleton-on-Hudson, NY 12033. Phone: (518) 732-0879 / Fax: (518) 732-0835. 
Hours: Monday-Wednesday 12:00-8:00 pm; Thursday-Friday 10:00 am - 6:00 pm; Saturday-Sunday 11:00 am - 4:00 pm.