Dust off the cassette tapes with a soft cloth or towel to remove any loose dust and dirt.
Place the cassettes in a box. Use multiple boxes if you have a large amount of cassettes.
Contact your area's public library, school system or church. Ask the library, school system or church if they accept cassette donations.
Contact the Goodwill or Salvation Army if the public library, school system or church in your area doesn't accept cassette donations.
Take the box(es) of cassettes to the public library, school system, church, Goodwill or Salvation Army.
Ask for a receipt for tax purposes. Store the receipt in a safe place.