Costilla County Public Library, serving an area of 3,700 residents, has a collection of 4,800 books and periodicals; in addition, there are 147 CDs, records, cassettes and other audio materials, as well as 80 video items, such as DVDs and VHS tapes. Internet terminals are available for use by the general public.
Staffing consists of one employee, including one fully accredited librarian, plus volunteers. Annual expenditures on the library collection total $3,800. Patrons make 3,300 visits annually, and check out materials 10,000 times. Thirty percent of all check-outs are children's materials.