If you’d like to do your TWIC renewal in person as opposed to online (or need to, as this may be required under circumstances, like a name change) then you will have to find a renewal center near you.
Keep in mind that the DHS has the most complete and most up-to-date list. Their tool isn’t always that convenient, but it’s worth keeping in mind!
Below won’t be a full list, as there are hundreds of locations where you can renew your TWIC card, but it’ll be a good starting point for most of the 2 million (or so) TWIC holders in the United States.
The rule of thumb will be to look for an IdentoGo or Staples office center near you as most renewals are handled at these locations.
Make sure to make an appointment first!