Answer: USA (3 letters).
Why USA is the answer
U.S. Forever stamp designs commonly include USA to identify the issuing country. They also usually carry FOREVER instead of a printed dollar-and-cent denomination for the ordinary First-Class Mail Forever category.
| Clue | Length | Answer |
|---|---|---|
| Letters on Forever stamps | 3 | USA |
| Word on a Forever stamp | 7 | FOREVER |
Check the grid length
If your puzzle asks for three letters, USA is the standard fit. If it asks for seven, the clue may be looking for FOREVER instead. Cross letters should resolve any variation in the wording.
Stamp-reading note
Artwork changes across issues, so the placement and typography of USA and FOREVER can vary. See what Forever stamps look like for a fuller visual identification guide.
Checked September 1, 2026: current USPS Forever stamp listings and the common three-letter crossword result.