Even though I haven't lived there since 1986. My mother, who has nothing else better to do, calls the number on the letter, and tells (brags) that her son is working on another continent. She has repeatedly requested that my name be removed from the list, which doesn't seem to work.
I'm the eJuror administrator at a Federal courthouse.
Jury wheels are based on voter registration rolls (or, in very few states, city/town residency records) for the state the court is in. If you're still getting service requests, it's because you haven't updated your voter registration to reflect your new address (or, in the aforementioned very few states, your local clerk is still submitting your name as a resident).
The jury wheel is reloaded every 1-4 years, depending on the district. If your name is still being submitted by the state or town, you're going to stay in the list. The people at the Federal courthouse don't have the authority to remove you from the list, and calling them will have no effect.