From the TPL site:
“Available online 24/7, this library is always open! Explore our growing collection of downloadable Audiobooks. You can download selections to your to your computer, transfer them to an MP3 player, or burn selected titles onto a CD for listening on-the-go. Borrow up to 10 items for 21 days using your valid Tacoma Public Library card and PIN. It’s quick, easy and you can do it anytime!

More at the Library.