Direct answer: Library "Friends of the Library" book sale programs and organizations like Better World Books put donated books to the most direct further use — either resold to fund library programs or redistributed to literacy nonprofits — compared to general thrift donation bins, which sort books alongside all other merchandise.
What actually happens after you donate
Most donation destinations sort incoming books by condition and demand: strong sellers often go to a resale shelf or online marketplace listing, mid-tier books go to general shelves or bulk sale, and heavily damaged books are typically recycled rather than distributed.
Library-affiliated donation programs
"Friends of the Library" groups run ongoing or seasonal used-book sales, with proceeds funding library programs directly — a donation here has a clear, local, and transparent destination.
Better World Books and literacy nonprofits
Better World Books collects donated books through partner drop boxes and library programs, then sells usable copies online (funding literacy initiatives) and diverts unsellable stock away from landfills through recycling partnerships.
What not to donate
Moldy, heavily water-damaged, or extremely outdated reference material (old encyclopedias, superseded textbooks) is rarely usable to any donation recipient and is often discarded rather than distributed — recycling these directly is usually more useful than donating them.
Do libraries always accept book donations?
Most do, though some limit quantity, condition, or subject matter — check your specific library's donation policy before dropping off a large collection.
Is it tax-deductible to donate books?
Donations to registered 501(c)(3) nonprofits, including many library Friends groups, are generally tax-deductible in the U.S.; keep a receipt and consult a tax professional for specifics.
What happens to books that can't be resold?
Reputable donation programs typically recycle unsellable books rather than sending them to a landfill, though practices vary by organization.